XML 51 R37.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Claim, Claim Adjustment Expense and Future Policy Benefit Reserves (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration insurance contracts, reconciliation of claims development to liability | The table below reconciles the net liability for unpaid claim and claim adjustment expenses to the amount presented on the Consolidated Balance Sheets.
As of December 31 |
(In millions) | 2021
Net liability for unpaid claim and claim adjustment expenses: |
Specialty | $ | 5,265 |
Commercial | 8,065 |
International | 1,940 |
Life & Group (1) | 3,641 |
Corporate & Other | 294 |
Total net claim and claim adjustment expenses | 19,205 |
Reinsurance receivables: (2) |
Specialty | 1,168 |
Commercial | 825 |
International | 340 |
Life & Group | 113 |
Corporate & Other (3) | 2,523 |
Total reinsurance receivables | 4,969 |
Total gross liability for unpaid claim and claim adjustment expenses | $ | 24,174 |
(1) The Life & Group segment amounts are primarily related to long term care claim reserves, but also include amounts related to unfunded structured settlements arising from short-duration contracts. Long term care policies are long-duration contracts. (2) Reinsurance receivables presented are gross of the allowance for uncollectible reinsurance and do not include reinsurance receivables related to paid losses. (3) The Corporate & Other Reinsurance receivables are primarily related to A&EP claims covered under the Loss Portfolio Transfer (LPT).
Schedule of liability for unpaid claims and claims adjustment expense | The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group segment.
As of or for the years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Reserves, beginning of year: |  |  |  |  |
Gross | $ | 22,706 |  |  | $ | 21,720 |  |  | $ | 21,984 |
Ceded | 4,005 |  |  | 3,835 |  |  | 4,019 |
Net reserves, beginning of year | 18,701 |  |  | 17,885 |  |  | 17,965 |
Reduction of net reserves due to Excess Workers' Compensation Loss Portfolio Transfer | (632) |  |  | — |  |  | — |
Net incurred claim and claim adjustment expenses: |  |  |  |  |
Provision for insured events of current year | 5,970 |  |  | 5,793 |  |  | 5,356 |
Increase (decrease) in provision for insured events of prior years | (104) |  |  | (119) |  |  | (127) |
Amortization of discount | 174 |  |  | 183 |  |  | 184 |
Total net incurred (1) | 6,040 |  |  | 5,857 |  |  | 5,413 |
Net payments attributable to: |  |  |  |  |
Current year events | (1,014) |  |  | (948) |  |  | (992) |
Prior year events | (3,830) |  |  | (4,216) |  |  | (4,584) |
Total net payments | (4,844) |  |  | (5,164) |  |  | (5,576) |
Foreign currency translation adjustment and other | (60) |  |  | 123 |  |  | 83 |
Net reserves, end of year | 19,205 |  |  | 18,701 |  |  | 17,885 |
Ceded reserves, end of year | 4,969 |  |  | 4,005 |  |  | 3,835 |
Gross reserves, end of year | $ | 24,174 |  |  | $ | 22,706 |  |  | $ | 21,720 |
(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, the loss on the Excess Workers' Compensation LPT, uncollectible reinsurance and benefit expenses related to future policy benefits, which are not reflected in the table above.
Gross and net carried claim and claim adjustment expense reserves | The following tables present the gross and net carried reserves.
December 31, 2021 | Specialty |  | Commercial |  | International |  | Life & Group |  | Corporate & Other |  | Total
(In millions) |  |  |  |  |
Gross Case Reserves | $ | 1,578 |  |  | $ | 3,184 |  |  | $ | 859 |  |  | $ | 3,383 |  |  | $ | 1,551 |  |  | $ | 10,555 |
Gross IBNR Reserves | 4,855 |  |  | 5,706 |  |  | 1,421 |  |  | 371 |  |  | 1,266 |  |  | 13,619 |
Total Gross Carried Claim and Claim Adjustment Expense Reserves | $ | 6,433 |  |  | $ | 8,890 |  |  | $ | 2,280 |  |  | $ | 3,754 |  |  | $ | 2,817 |  |  | $ | 24,174 |
Net Case Reserves | $ | 1,338 |  |  | $ | 2,850 |  |  | $ | 744 |  |  | $ | 3,291 |  |  | $ | 146 |  |  | $ | 8,369 |
Net IBNR Reserves | 3,927 |  |  | 5,215 |  |  | 1,196 |  |  | 350 |  |  | 148 |  |  | 10,836 |
Total Net Carried Claim and Claim Adjustment Expense Reserves | $ | 5,265 |  |  | $ | 8,065 |  |  | $ | 1,940 |  |  | $ | 3,641 |  |  | $ | 294 |  |  | $ | 19,205 |
December 31, 2020 | Specialty |  | Commercial |  | International |  | Life & Group |  | Corporate & Other |  | Total
(In millions) |  |  |  |  |
Gross Case Reserves | $ | 1,567 |  |  | $ | 3,215 |  |  | $ | 892 |  |  | $ | 3,406 |  |  | $ | 1,614 |  |  | $ | 10,694 |
Gross IBNR Reserves | 4,181 |  |  | 5,035 |  |  | 1,199 |  |  | 337 |  |  | 1,260 |  |  | 12,012 |
Total Gross Carried Claim and Claim Adjustment Expense Reserves | $ | 5,748 |  |  | $ | 8,250 |  |  | $ | 2,091 |  |  | $ | 3,743 |  |  | $ | 2,874 |  |  | $ | 22,706 |
Net Case Reserves | $ | 1,410 |  |  | $ | 2,885 |  |  | $ | 777 |  |  | $ | 3,298 |  |  | $ | 560 |  |  | $ | 8,930 |
Net IBNR Reserves | 3,488 |  |  | 4,590 |  |  | 1,045 |  |  | 317 |  |  | 331 |  |  | 9,771 |
Total Net Carried Claim and Claim Adjustment Expense Reserves | $ | 4,898 |  |  | $ | 7,475 |  |  | $ | 1,822 |  |  | $ | 3,615 |  |  | $ | 891 |  |  | $ | 18,701 |
Net prior year development | The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Pretax (favorable) unfavorable development: |  |  |  |  |
Specialty | $ | (45) |  |  | $ | (61) |  |  | $ | (92) |
Commercial | (6) |  |  | (7) |  |  | (40) |
International | 2 |  |  | (2) |  |  | 21 |
Corporate & Other | 60 |  |  | 50 |  |  | 38 |
Total pretax (favorable) unfavorable development | $ | 11 |  |  | $ | (20) |  |  | $ | (73) |
Impact of loss portfolio transfer on the consolidated statement of operations | The following table presents the impact of the Loss Portfolio Transfer on the Consolidated Statements of Operations.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Additional amounts ceded under LPT: |  |  |  |  |
Net A&EP adverse development before consideration of LPT | $ | 143 |  |  | $ | 125 |  |  | $ | 150 |
Provision for uncollectible third-party reinsurance on A&EP | (5) |  |  | (25) |  |  | (25) |
Total additional amounts ceded under LPT | 138 |  |  | 100 |  |  | 125 |
Retroactive reinsurance benefit recognized | (107) |  |  | (94) |  |  | (107) |
Pretax impact of deferred retroactive reinsurance | $ | 31 |  |  | $ | 6 |  |  | $ | 18 |
Specialty |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration insurance contracts, reconciliation of claims development to liability | The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Specialty segment.
As of December 31 |
(In millions) | 2021
Net liability for unpaid claim and claim adjustment expenses: |
Medical Professional Liability | $ | 1,556 |
Other Professional Liability and Management Liability | 3,159 |
Surety | 406 |
Warranty | 44 |
Other | 100 |
Total net liability for unpaid claim and claim adjustment expenses | $ | 5,265 |
Net prior year claim and allocated claim adjustment expense reserve development | The following table presents further detail of the development recorded for the Specialty segment.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Pretax (favorable) unfavorable development: |  |  |  |  |
Medical Professional Liability | $ | 23 |  |  | $ | 35 |  |  | $ | 75 |
Other Professional Liability and Management Liability | 24 |  |  | (15) |  |  | (69) |
Surety | (73) |  |  | (69) |  |  | (92) |
Warranty | (14) |  |  | (7) |  |  | (15) |
Other | (5) |  |  | (5) |  |  | 9 |
Total pretax (favorable) unfavorable development | $ | (45) |  |  | $ | (61) |  |  | $ | (92) |
Commercial |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration insurance contracts, reconciliation of claims development to liability | The table below provides the line of business composition of the net liability for unpaid claim and claim adjustment expenses for the Commercial segment.
As of December 31 |
(In millions) | 2021
Net Claim and claim adjustment expenses: |
Commercial Auto | $ | 673 |
General Liability | 2,911 |
Workers' Compensation | 3,850 |
Property and Other | 631 |
Total net liability for claim and claim adjustment expenses | $ | 8,065 |
Net prior year claim and allocated claim adjustment expense reserve development | The following table presents further detail of the development recorded for the Commercial segment.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Pretax (favorable) unfavorable development: |  |  |  |  |
Commercial Auto | $ | 53 |  |  | $ | 33 |  |  | $ | (25) |
General Liability | 15 |  |  | 15 |  |  | 16 |
Workers' Compensation | (82) |  |  | (96) |  |  | (13) |
Property and Other | 8 |  |  | 41 |  |  | (18) |
Total pretax (favorable) unfavorable development | $ | (6) |  |  | $ | (7) |  |  | $ | (40) |
International |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration insurance contracts, reconciliation of claims development to liability | The table below provides the composition of the net liability for unpaid claim and claim adjustment expenses for the International segment.
As of December 31 |
(In millions) | 2021
Net Claim and claim adjustment expenses: |
International excluding Hardy | $ | 1,400 |
Hardy | 540 |
Total net liability for claim and claim adjustment expenses | $ | 1,940 |
Net prior year claim and allocated claim adjustment expense reserve development | The following table presents further detail of the development recorded for the International segment.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Pretax (favorable) unfavorable development: |  |  |  |  |
Commercial | $ | (35) |  |  | (2) |  |  | $ | (8) |
Specialty | 36 |  |  | 3 |  |  | 37 |
Other | 1 |  |  | (3) |  |  | (8) |
Total pretax (favorable) unfavorable development | $ | 2 |  |  | $ | (2) |  |  | $ | 21 |
(1) Effective December 31, 2021 the International lines of business were consolidated to align with domestic operations. Prior period information has been conformed to the new line of business presentation.
CNAF Consolidated |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Schedule of historical claims duration | The table below presents information about average historical claims duration as of December 31, 2021 and is presented as required supplementary information, which is unaudited.
Average Annual Percentage Payout of Ultimate Net Incurred Claim and Allocated Claim Adjustment Expenses in Year:
| 1 |  | 2 |  | 3 |  | 4 |  | 5 |  | 6 |  | 7 |  | 8 |  | 9 |  | 10
Specialty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Medical Professional Liability | 3.6 | % |  | 18.3 | % |  | 23.7 | % |  | 18.2 | % |  | 12.0 | % |  | 8.3 | % |  | 5.1 | % |  | 2.8 | % |  | 0.7 | % |  | 1.0 | %
Other Professional Liability and Management Liability | 6.7 | % |  | 21.9 | % |  | 21.1 | % |  | 16.7 | % |  | 9.9 | % |  | 6.4 | % |  | 4.3 | % |  | 3.5 | % |  | 1.7 | % |  | 0.5 | %
Surety(1) | 14.1 | % |  | 48.7 | % |  | 18.9 | % |  | 2.6 | % |  | 1.1 | % |  | 1.3 | % |  | — | % |  | 0.4 | % |  | (0.8) | % |  | — | %
Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Auto | 26.7 | % |  | 23.2 | % |  | 18.0 | % |  | 13.6 | % |  | 10.1 | % |  | 3.2 | % |  | 1.5 | % |  | 0.4 | % |  | — | % |  | 0.3 | %
General Liability | 4.1 | % |  | 14.1 | % |  | 18.0 | % |  | 19.0 | % |  | 13.5 | % |  | 8.7 | % |  | 5.6 | % |  | 4.1 | % |  | 2.2 | % |  | 0.8 | %
Workers' Compensation | 14.7 | % |  | 21.7 | % |  | 13.9 | % |  | 9.5 | % |  | 6.4 | % |  | 2.7 | % |  | 1.1 | % |  | 1.5 | % |  | 0.4 | % |  | 0.5 | %
International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International - Excluding Hardy | 19.0 | % |  | 23.7 | % |  | 10.8 | % |  | 7.4 | % |  | 6.1 | % |  | 5.7 | % |  | 6.8 | % |  | 2.6 | % |  | 1.6 | % |  | 1.2 | %
International - Hardy (2) | 20.4 | % |  | 36.1 | % |  | 13.4 | % |  | 6.9 | % |  | 4.4 | % |  | 3.9 | % |  | 1.0 | % |  | 0.6 | % |  | 0.7 | % |  |
(1) Due to the nature of the Surety business, average annual percentage payout of ultimate net incurred claim and allocated claim adjustment expenses has been calculated using only the payouts of mature accident years presented in the loss reserve development tables. (2) Average historical claims duration for Hardy is presented prospectively beginning with the first full year subsequent to acquisition, 2013.
Hardy | International |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 |  |  |  |  |  | Calendar Year | As of December 31, 2021
(In millions, except reported claims data) | Net Claim and Allocated Claim Adjustment Expense Reserves at Acquisition |  | Net Incurred Claim and Allocated Claim Adjustment Expenses in 2012(1)(2) |  | Total Acquired Net Claim and Allocated Claim Adjustment Expense Reserves and 2012 Incurreds |  | 2013(1)(2) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 34 |  |  | $ | 71 |  |  | $ | 105 |  |  | $ | 105 |  |  | $ | 112 |  |  | $ | 120 |  |  | $ | 113 |  |  | $ | 114 |  |  | $ | 116 |  |  | $ | 115 |  |  | $ | 113 |  |  | $ | 114 |  |  | $ | (3) |  |  | 7,045 |
2013 |  |  |  |  |  |  | 132 |  |  | 147 |  |  | 139 |  |  | 140 |  |  | 142 |  |  | 145 |  |  | 146 |  |  | 146 |  |  | 144 |  |  | 7 |  |  | 7,893 |
2014 |  |  |  |  |  |  |  |  | 186 |  |  | 184 |  |  | 178 |  |  | 171 |  |  | 172 |  |  | 173 |  |  | 172 |  |  | 169 |  |  | (6) |  |  | 8,493 |
2015 |  |  |  |  |  |  |  |  |  |  | 191 |  |  | 181 |  |  | 179 |  |  | 180 |  |  | 178 |  |  | 180 |  |  | 181 |  |  | (1) |  |  | 9,669 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  | 231 |  |  | 249 |  |  | 238 |  |  | 226 |  |  | 228 |  |  | 222 |  |  | (1) |  |  | 10,746 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 246 |  |  | 256 |  |  | 244 |  |  | 246 |  |  | 253 |  |  | 8 |  |  | 13,029 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 275 |  |  | 306 |  |  | 310 |  |  | 316 |  |  | 36 |  |  | 14,868 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 224 |  |  | 228 |  |  | 223 |  |  | 42 |  |  | 10,891 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 215 |  |  | 205 |  |  | 87 |  |  | 5,963 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 181 |  |  | 128 |  |  | 2,244 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 2,008 |  |  | $ | 297 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 |  |  | Calendar Year
(In millions) |  |  | 2012(1) | 2013(1)(2) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 14 |  | $ | 80 |  |  | $ | 100 |  |  | $ | 109 |  |  | $ | 107 |  |  | $ | 109 |  |  | $ | 110 |  |  | $ | 111 |  |  | $ | 112 |  |  | $ | 115 |
2013 |  |  |  | 38 |  |  | 102 |  |  | 122 |  |  | 128 |  |  | 132 |  |  | 135 |  |  | 139 |  |  | 140 |  |  | 141 |
2014 |  |  |  |  |  | 56 |  |  | 124 |  |  | 142 |  |  | 152 |  |  | 157 |  |  | 163 |  |  | 165 |  |  | 166 |
2015 |  |  |  |  |  |  |  | 30 |  |  | 99 |  |  | 130 |  |  | 146 |  |  | 158 |  |  | 166 |  |  | 164 |
2016 |  |  |  |  |  |  |  |  |  | 64 |  |  | 146 |  |  | 174 |  |  | 183 |  |  | 196 |  |  | 208 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 53 |  |  | 152 |  |  | 185 |  |  | 207 |  |  | 215 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | 55 |  |  | 176 |  |  | 205 |  |  | 236 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  |  | 104 |  |  | 142 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  | 79 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |
Total | $ | 1,479 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented | $ | 529 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 | 3 |
Liability for unallocated claim adjustment expenses for accident years presented | 8 |
Total net liability for unpaid claim and claim adjustment expenses | $ | 540 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 | Calendar Year |  |
(In millions) |  |  | 2013(1)(2) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total(3)
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | — |  |  | $ | 7 |  |  | $ | 8 |  |  | $ | (7) |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | (1) |  |  | $ | (2) |  |  | $ | 1 |  |  | $ | 9 |
2013 |  |  |  |  | 15 |  |  | (8) |  |  | 1 |  |  | 2 |  |  | 3 |  |  | 1 |  |  | — |  |  | (2) |  |  | 12 |
2014 |  |  |  |  |  |  | (2) |  |  | (6) |  |  | (7) |  |  | 1 |  |  | 1 |  |  | (1) |  |  | (3) |  |  | (17) |
2015 |  |  |  |  |  |  |  |  | (10) |  |  | (2) |  |  | 1 |  |  | (2) |  |  | 2 |  |  | 1 |  |  | (10) |
2016 |  |  |  |  |  |  |  |  |  |  | 18 |  |  | (11) |  |  | (12) |  |  | 2 |  |  | (6) |  |  | (9) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  | (12) |  |  | 2 |  |  | 7 |  |  | 7 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31 |  |  | 4 |  |  | 6 |  |  | 41 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  | (5) |  |  | (1) |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) |  |  | (10) |
(1) Data presented for these calendar years is required supplemental information, which is unaudited. (2) Data presented for this calendar year is post-acquisition of Hardy. (3) The amounts included in the loss reserve development tables above are presented at the year-end 2021 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 101 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.
Medical Professional Liability | Specialty |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 464 |  |  | $ | 469 |  |  | $ | 508 |  |  | $ | 498 |  |  | $ | 493 |  |  | $ | 484 |  |  | $ | 493 |  |  | $ | 499 |  |  | $ | 497 |  |  | $ | 497 |  |  | $ | 4 |  |  | 17,755 |
2013 |  |  | 462 |  |  | 479 |  |  | 500 |  |  | 513 |  |  | 525 |  |  | 535 |  |  | 545 |  |  | 531 |  |  | 530 |  |  | 11 |  |  | 19,565 |
2014 |  |  |  |  | 450 |  |  | 489 |  |  | 537 |  |  | 530 |  |  | 535 |  |  | 529 |  |  | 527 |  |  | 524 |  |  | 8 |  |  | 19,800 |
2015 |  |  |  |  |  |  | 433 |  |  | 499 |  |  | 510 |  |  | 494 |  |  | 488 |  |  | 510 |  |  | 501 |  |  | 28 |  |  | 18,170 |
2016 |  |  |  |  |  |  |  |  | 427 |  |  | 487 |  |  | 485 |  |  | 499 |  |  | 508 |  |  | 510 |  |  | 24 |  |  | 16,085 |
2017 |  |  |  |  |  |  |  |  |  |  | 412 |  |  | 449 |  |  | 458 |  |  | 460 |  |  | 455 |  |  | 41 |  |  | 15,197 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 404 |  |  | 429 |  |  | 431 |  |  | 448 |  |  | 60 |  |  | 14,997 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 430 |  |  | 445 |  |  | 458 |  |  | 156 |  |  | 13,804 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 477 |  |  | 476 |  |  | 347 |  |  | 9,935 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 377 |  |  | 337 |  |  | 6,761 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 4,776 |  |  | $ | 1,016 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 14 |  |  | $ | 117 |  |  | $ | 221 |  |  | $ | 323 |  |  | $ | 388 |  |  | $ | 427 |  |  | $ | 457 |  |  | $ | 479 |  |  | $ | 482 |  |  | $ | 487 |
2013 |  |  | 17 |  |  | 119 |  |  | 255 |  |  | 355 |  |  | 414 |  |  | 462 |  |  | 495 |  |  | 508 |  |  | 512 |
2014 |  |  |  |  | 23 |  |  | 136 |  |  | 258 |  |  | 359 |  |  | 417 |  |  | 472 |  |  | 489 |  |  | 497 |
2015 |  |  |  |  |  |  | 22 |  |  | 101 |  |  | 230 |  |  | 313 |  |  | 384 |  |  | 420 |  |  | 444 |
2016 |  |  |  |  |  |  |  |  | 18 |  |  | 121 |  |  | 246 |  |  | 339 |  |  | 401 |  |  | 436 |
2017 |  |  |  |  |  |  |  |  |  |  | 19 |  |  | 107 |  |  | 235 |  |  | 308 |  |  | 355 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  |  | 115 |  |  | 211 |  |  | 290 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  | 91 |  |  | 183 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  | 61 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 3,276 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 1,500 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 28 |
Liability for unallocated claim adjustment expenses for accident years presented |  | 28 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 1,556 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 5 |  |  | $ | 39 |  |  | $ | (10) |  |  | $ | (5) |  |  | $ | (9) |  |  | $ | 9 |  |  | $ | 6 |  |  | $ | (2) |  |  | $ | — |  |  | $ | 33 |
2013 |  |  |  |  | 17 |  |  | 21 |  |  | 13 |  |  | 12 |  |  | 10 |  |  | 10 |  |  | (14) |  |  | (1) |  |  | 68 |
2014 |  |  |  |  |  |  | 39 |  |  | 48 |  |  | (7) |  |  | 5 |  |  | (6) |  |  | (2) |  |  | (3) |  |  | 74 |
2015 |  |  |  |  |  |  |  |  | 66 |  |  | 11 |  |  | (16) |  |  | (6) |  |  | 22 |  |  | (9) |  |  | 68 |
2016 |  |  |  |  |  |  |  |  |  |  | 60 |  |  | (2) |  |  | 14 |  |  | 9 |  |  | 2 |  |  | 83 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | 37 |  |  | 9 |  |  | 2 |  |  | (5) |  |  | 43 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  | 2 |  |  | 17 |  |  | 44 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  | 13 |  |  | 28 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  | (1) |
Total net development for the accident years presented above |  | 52 |  |  | 32 |  |  | 13 |  |  |
Total net development for accident years prior to 2012 |  | 21 |  |  | 3 |  |  | 3 |  |  |
Total unallocated claim adjustment expense development |  | 2 |  |  | — |  |  | 7 |  |  |
Total |  | $ | 75 |  |  | $ | 35 |  |  | $ | 23 |  |  |
(1) Data presented for these calendar years is required supplemental information, which is unaudited.
Other Professional Liability and Management Liability | Specialty |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 923 |  |  | $ | 909 |  |  | $ | 887 |  |  | $ | 878 |  |  | $ | 840 |  |  | $ | 846 |  |  | $ | 833 |  |  | $ | 831 |  |  | $ | 850 |  |  | $ | 848 |  |  | $ | 18 |  |  | 18,506 |
2013 |  |  | 884 |  |  | 894 |  |  | 926 |  |  | 885 |  |  | 866 |  |  | 863 |  |  | 850 |  |  | 846 |  |  | 833 |  |  | 30 |  |  | 17,950 |
2014 |  |  |  |  | 878 |  |  | 898 |  |  | 885 |  |  | 831 |  |  | 835 |  |  | 854 |  |  | 845 |  |  | 841 |  |  | 37 |  |  | 17,577 |
2015 |  |  |  |  |  |  | 888 |  |  | 892 |  |  | 877 |  |  | 832 |  |  | 807 |  |  | 813 |  |  | 836 |  |  | 41 |  |  | 17,436 |
2016 |  |  |  |  |  |  |  |  | 901 |  |  | 900 |  |  | 900 |  |  | 904 |  |  | 907 |  |  | 891 |  |  | 84 |  |  | 17,968 |
2017 |  |  |  |  |  |  |  |  |  |  | 847 |  |  | 845 |  |  | 813 |  |  | 791 |  |  | 775 |  |  | 152 |  |  | 18,159 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 850 |  |  | 864 |  |  | 869 |  |  | 906 |  |  | 202 |  |  | 19,926 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 837 |  |  | 845 |  |  | 856 |  |  | 283 |  |  | 19,357 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 930 |  |  | 944 |  |  | 568 |  |  | 19,095 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,037 |  |  | 911 |  |  | 15,487 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 8,767 |  |  | $ | 2,326 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 56 |  |  | $ | 248 |  |  | $ | 400 |  |  | $ | 573 |  |  | $ | 651 |  |  | $ | 711 |  |  | $ | 755 |  |  | $ | 792 |  |  | $ | 812 |  |  | $ | 816 |
2013 |  |  | 54 |  |  | 249 |  |  | 447 |  |  | 618 |  |  | 702 |  |  | 754 |  |  | 771 |  |  | 779 |  |  | 787 |
2014 |  |  |  |  | 51 |  |  | 223 |  |  | 392 |  |  | 515 |  |  | 647 |  |  | 707 |  |  | 743 |  |  | 787 |
2015 |  |  |  |  |  |  | 60 |  |  | 234 |  |  | 404 |  |  | 542 |  |  | 612 |  |  | 677 |  |  | 725 |
2016 |  |  |  |  |  |  |  |  | 64 |  |  | 248 |  |  | 466 |  |  | 625 |  |  | 701 |  |  | 736 |
2017 |  |  |  |  |  |  |  |  |  |  | 57 |  |  | 222 |  |  | 394 |  |  | 498 |  |  | 557 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 54 |  |  | 282 |  |  | 473 |  |  | 599 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64 |  |  | 263 |  |  | 422 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67 |  |  | 248 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 5,735 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 3,032 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 74 |
Liability for unallocated claim adjustment expenses for accident years presented |  | 53 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 3,159 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | (14) |  |  | $ | (22) |  |  | $ | (9) |  |  | $ | (38) |  |  | $ | 6 |  |  | $ | (13) |  |  | $ | (2) |  |  | $ | 19 |  |  | $ | (2) |  |  | $ | (75) |
2013 |  |  |  |  | 10 |  |  | 32 |  |  | (41) |  |  | (19) |  |  | (3) |  |  | (13) |  |  | (4) |  |  | (13) |  |  | (51) |
2014 |  |  |  |  |  |  | 20 |  |  | (13) |  |  | (54) |  |  | 4 |  |  | 19 |  |  | (9) |  |  | (4) |  |  | (37) |
2015 |  |  |  |  |  |  |  |  | 4 |  |  | (15) |  |  | (45) |  |  | (25) |  |  | 6 |  |  | 23 |  |  | (52) |
2016 |  |  |  |  |  |  |  |  |  |  | (1) |  |  | — |  |  | 4 |  |  | 3 |  |  | (16) |  |  | (10) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  | (32) |  |  | (22) |  |  | (16) |  |  | (72) |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  | 5 |  |  | 37 |  |  | 56 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  | 11 |  |  | 19 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  | 14 |
Total net development for the accident years presented above |  | (35) |  |  | 6 |  |  | 34 |  |  |
Total net development for accident years prior to 2012 |  | (20) |  |  | (21) |  |  | (12) |  |  |
Total unallocated claim adjustment expense development |  | (14) |  |  | — |  |  | 2 |  |  |
Total |  | $ | (69) |  |  | $ | (15) |  |  | $ | 24 |  |  |
(1) Data presented for these calendar years is required supplemental information, which is unaudited.
Surety | Specialty |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 120 |  |  | $ | 122 |  |  | $ | 98 |  |  | $ | 70 |  |  | $ | 52 |  |  | $ | 45 |  |  | $ | 39 |  |  | $ | 38 |  |  | $ | 37 |  |  | $ | 36 |  |  | $ | 1 |  |  | 5,586 |
2013 |  |  | 120 |  |  | 121 |  |  | 115 |  |  | 106 |  |  | 91 |  |  | 87 |  |  | 83 |  |  | 82 |  |  | 82 |  |  | 2 |  |  | 5,088 |
2014 |  |  |  |  | 123 |  |  | 124 |  |  | 94 |  |  | 69 |  |  | 60 |  |  | 45 |  |  | 45 |  |  | 43 |  |  | 1 |  |  | 5,118 |
2015 |  |  |  |  |  |  | 131 |  |  | 131 |  |  | 104 |  |  | 79 |  |  | 63 |  |  | 58 |  |  | 53 |  |  | 9 |  |  | 5,055 |
2016 |  |  |  |  |  |  |  |  | 124 |  |  | 124 |  |  | 109 |  |  | 84 |  |  | 67 |  |  | 64 |  |  | 10 |  |  | 5,521 |
2017 |  |  |  |  |  |  |  |  |  |  | 120 |  |  | 115 |  |  | 103 |  |  | 84 |  |  | 71 |  |  | 9 |  |  | 5,795 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 114 |  |  | 108 |  |  | 91 |  |  | 62 |  |  | 19 |  |  | 6,097 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119 |  |  | 112 |  |  | 98 |  |  | 44 |  |  | 5,816 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128 |  |  | 119 |  |  | 104 |  |  | 4,006 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137 |  |  | 129 |  |  | 2,592 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 765 |  |  | $ | 328 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 5 |  |  | $ | 32 |  |  | $ | 34 |  |  | $ | 35 |  |  | $ | 35 |  |  | $ | 36 |  |  | $ | 37 |  |  | $ | 37 |  |  | $ | 36 |  |  | $ | 36 |
2013 |  |  | 16 |  |  | 40 |  |  | 69 |  |  | 78 |  |  | 78 |  |  | 78 |  |  | 77 |  |  | 78 |  |  | 79 |
2014 |  |  |  |  | 7 |  |  | 30 |  |  | 38 |  |  | 36 |  |  | 38 |  |  | 38 |  |  | 39 |  |  | 39 |
2015 |  |  |  |  |  |  | 7 |  |  | 26 |  |  | 38 |  |  | 40 |  |  | 42 |  |  | 44 |  |  | 42 |
2016 |  |  |  |  |  |  |  |  | 5 |  |  | 37 |  |  | 45 |  |  | 45 |  |  | 43 |  |  | 43 |
2017 |  |  |  |  |  |  |  |  |  |  | 23 |  |  | 37 |  |  | 41 |  |  | 46 |  |  | 49 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  | 25 |  |  | 34 |  |  | 39 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  | 34 |  |  | 44 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  | 20 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 396 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 369 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 17 |
Liability for unallocated claim adjustment expenses for accident years presented |  | 20 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 406 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 2 |  |  | $ | (24) |  |  | $ | (28) |  |  | $ | (18) |  |  | $ | (7) |  |  | $ | (6) |  |  | $ | (1) |  |  | $ | (1) |  |  | $ | (1) |  |  | $ | (84) |
2013 |  |  |  |  | 1 |  |  | (6) |  |  | (9) |  |  | (15) |  |  | (4) |  |  | (4) |  |  | (1) |  |  | — |  |  | (38) |
2014 |  |  |  |  |  |  | 1 |  |  | (30) |  |  | (25) |  |  | (9) |  |  | (15) |  |  | — |  |  | (2) |  |  | (80) |
2015 |  |  |  |  |  |  |  |  | — |  |  | (27) |  |  | (25) |  |  | (16) |  |  | (5) |  |  | (5) |  |  | (78) |
2016 |  |  |  |  |  |  |  |  |  |  | — |  |  | (15) |  |  | (25) |  |  | (17) |  |  | (3) |  |  | (60) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | (5) |  |  | (12) |  |  | (19) |  |  | (13) |  |  | (49) |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6) |  |  | (17) |  |  | (29) |  |  | (52) |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  | (14) |  |  | (21) |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) |  |  | (9) |
Total net development for the accident years presented above |  | (79) |  |  | (67) |  |  | (76) |  |  |
Total net development for accident years prior to 2012 |  | (3) |  |  | (2) |  |  | 3 |  |  |
Total unallocated claim adjustment expense development |  | (10) |  |  | — |  |  | — |  |  |
Total |  | $ | (92) |  |  | $ | (69) |  |  | $ | (73) |  |  |
(1) Data presented for these calendar years is required supplemental information, which is unaudited.
Commercial Auto | Commercial |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 275 |  |  | $ | 289 |  |  | $ | 299 |  |  | $ | 303 |  |  | $ | 307 |  |  | $ | 299 |  |  | $ | 299 |  |  | $ | 297 |  |  | $ | 296 |  |  | $ | 295 |  |  | $ | 1 |  |  | 46,288 |
2013 |  |  | 246 |  |  | 265 |  |  | 265 |  |  | 249 |  |  | 245 |  |  | 245 |  |  | 241 |  |  | 241 |  |  | 241 |  |  | 2 |  |  | 39,430 |
2014 |  |  |  |  | 234 |  |  | 223 |  |  | 212 |  |  | 205 |  |  | 205 |  |  | 201 |  |  | 201 |  |  | 202 |  |  | 2 |  |  | 33,628 |
2015 |  |  |  |  |  |  | 201 |  |  | 199 |  |  | 190 |  |  | 190 |  |  | 183 |  |  | 181 |  |  | 183 |  |  | 3 |  |  | 30,427 |
2016 |  |  |  |  |  |  |  |  | 198 |  |  | 186 |  |  | 186 |  |  | 186 |  |  | 190 |  |  | 195 |  |  | 3 |  |  | 30,449 |
2017 |  |  |  |  |  |  |  |  |  |  | 199 |  |  | 198 |  |  | 200 |  |  | 221 |  |  | 232 |  |  | 5 |  |  | 30,940 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 229 |  |  | 227 |  |  | 227 |  |  | 245 |  |  | 8 |  |  | 34,292 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 257 |  |  | 266 |  |  | 289 |  |  | 31 |  |  | 37,142 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310 |  |  | 303 |  |  | 107 |  |  | 28,837 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397 |  |  | 271 |  |  | 27,182 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 2,582 |  |  | $ | 433 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 78 |  |  | $ | 160 |  |  | $ | 220 |  |  | $ | 259 |  |  | $ | 282 |  |  | $ | 285 |  |  | $ | 290 |  |  | $ | 291 |  |  | $ | 291 |  |  | $ | 292 |
2013 |  |  | 74 |  |  | 135 |  |  | 168 |  |  | 200 |  |  | 225 |  |  | 234 |  |  | 238 |  |  | 239 |  |  | 239 |
2014 |  |  |  |  | 64 |  |  | 102 |  |  | 137 |  |  | 166 |  |  | 187 |  |  | 196 |  |  | 198 |  |  | 199 |
2015 |  |  |  |  |  |  | 52 |  |  | 96 |  |  | 130 |  |  | 153 |  |  | 172 |  |  | 175 |  |  | 178 |
2016 |  |  |  |  |  |  |  |  | 52 |  |  | 93 |  |  | 126 |  |  | 154 |  |  | 175 |  |  | 185 |
2017 |  |  |  |  |  |  |  |  |  |  | 58 |  |  | 107 |  |  | 150 |  |  | 178 |  |  | 203 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 66 |  |  | 128 |  |  | 175 |  |  | 212 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77 |  |  | 147 |  |  | 203 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71 |  |  | 134 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 1,928 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 654 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 5 |
Liability for unallocated claim adjustment expenses for accident years presented |  | 14 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 673 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 14 |  |  | $ | 10 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | (8) |  |  | $ | — |  |  | $ | (2) |  |  | $ | (1) |  |  | $ | (1) |  |  | $ | 20 |
2013 |  |  |  |  | 19 |  |  | — |  |  | (16) |  |  | (4) |  |  | — |  |  | (4) |  |  | — |  |  | — |  |  | (5) |
2014 |  |  |  |  |  |  | (11) |  |  | (11) |  |  | (7) |  |  | — |  |  | (4) |  |  | — |  |  | 1 |  |  | (32) |
2015 |  |  |  |  |  |  |  |  | (2) |  |  | (9) |  |  | — |  |  | (7) |  |  | (2) |  |  | 2 |  |  | (18) |
2016 |  |  |  |  |  |  |  |  |  |  | (12) |  |  | — |  |  | — |  |  | 4 |  |  | 5 |  |  | (3) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  | 2 |  |  | 21 |  |  | 11 |  |  | 33 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  | — |  |  | 18 |  |  | 16 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  | 23 |  |  | 32 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  | (7) |
Total net development for the accident years presented above |  | (17) |  |  | 31 |  |  | 52 |  |  |
Total net development for accident years prior to 2012 |  | (7) |  |  | 2 |  |  | 1 |  |  |
Total unallocated claim adjustment expense development |  | (1) |  |  | — |  |  | — |  |  |
Total |  | $ | (25) |  |  | $ | 33 |  |  | $ | 53 |  |  |
(1) Data presented for these calendar years is required supplemental information, which is unaudited.
General Liability | Commercial |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 587 |  |  | $ | 611 |  |  | $ | 639 |  |  | $ | 636 |  |  | $ | 619 |  |  | $ | 635 |  |  | $ | 635 |  |  | $ | 630 |  |  | $ | 632 |  |  | $ | 632 |  |  | $ | 20 |  |  | 35,313 |
2013 |  |  | 650 |  |  | 655 |  |  | 650 |  |  | 655 |  |  | 613 |  |  | 623 |  |  | 620 |  |  | 623 |  |  | 624 |  |  | 24 |  |  | 33,706 |
2014 |  |  |  |  | 653 |  |  | 658 |  |  | 654 |  |  | 631 |  |  | 635 |  |  | 658 |  |  | 659 |  |  | 659 |  |  | 28 |  |  | 28,064 |
2015 |  |  |  |  |  |  | 581 |  |  | 576 |  |  | 574 |  |  | 589 |  |  | 600 |  |  | 602 |  |  | 617 |  |  | 42 |  |  | 24,118 |
2016 |  |  |  |  |  |  |  |  | 623 |  |  | 659 |  |  | 667 |  |  | 671 |  |  | 673 |  |  | 683 |  |  | 68 |  |  | 24,511 |
2017 |  |  |  |  |  |  |  |  |  |  | 632 |  |  | 632 |  |  | 632 |  |  | 634 |  |  | 630 |  |  | 67 |  |  | 22,195 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 653 |  |  | 644 |  |  | 646 |  |  | 639 |  |  | 205 |  |  | 19,917 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680 |  |  | 682 |  |  | 682 |  |  | 330 |  |  | 18,602 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 723 |  |  | 722 |  |  | 516 |  |  | 13,028 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 782 |  |  | 706 |  |  | 9,759 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 6,670 |  |  | $ | 2,006 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 28 |  |  | $ | 132 |  |  | $ | 247 |  |  | $ | 374 |  |  | $ | 454 |  |  | $ | 510 |  |  | $ | 559 |  |  | $ | 579 |  |  | $ | 597 |  |  | $ | 602 |
2013 |  |  | 31 |  |  | 128 |  |  | 240 |  |  | 352 |  |  | 450 |  |  | 510 |  |  | 551 |  |  | 572 |  |  | 582 |
2014 |  |  |  |  | 31 |  |  | 119 |  |  | 247 |  |  | 376 |  |  | 481 |  |  | 547 |  |  | 569 |  |  | 607 |
2015 |  |  |  |  |  |  | 19 |  |  | 110 |  |  | 230 |  |  | 357 |  |  | 446 |  |  | 501 |  |  | 530 |
2016 |  |  |  |  |  |  |  |  | 32 |  |  | 163 |  |  | 279 |  |  | 407 |  |  | 481 |  |  | 524 |
2017 |  |  |  |  |  |  |  |  |  |  | 23 |  |  | 118 |  |  | 250 |  |  | 399 |  |  | 471 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  | 107 |  |  | 228 |  |  | 307 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  | 98 |  |  | 181 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  | 99 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 3,929 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 2,741 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 119 |
Liability for unallocated claim adjustment expenses for accident years presented |  | 51 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 2,911 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 24 |  |  | $ | 28 |  |  | $ | (3) |  |  | $ | (17) |  |  | $ | 16 |  |  | $ | — |  |  | $ | (5) |  |  | $ | 2 |  |  | $ | — |  |  | $ | 45 |
2013 |  |  |  |  | 5 |  |  | (5) |  |  | 5 |  |  | (42) |  |  | 10 |  |  | (3) |  |  | 3 |  |  | 1 |  |  | (26) |
2014 |  |  |  |  |  |  | 5 |  |  | (4) |  |  | (23) |  |  | 4 |  |  | 23 |  |  | 1 |  |  | — |  |  | 6 |
2015 |  |  |  |  |  |  |  |  | (5) |  |  | (2) |  |  | 15 |  |  | 11 |  |  | 2 |  |  | 15 |  |  | 36 |
2016 |  |  |  |  |  |  |  |  |  |  | 36 |  |  | 8 |  |  | 4 |  |  | 2 |  |  | 10 |  |  | 60 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | — |  |  | — |  |  | 2 |  |  | (4) |  |  | (2) |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) |  |  | 2 |  |  | (7) |  |  | (14) |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  | — |  |  | 2 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  | (1) |
Total net development for the accident years presented above |  | 21 |  |  | 16 |  |  | 14 |  |  |
Total net development for accident years prior to 2012 |  | (4) |  |  | (1) |  |  | (1) |  |  |
Total unallocated claim adjustment expense development |  | (1) |  |  | — |  |  | 2 |  |  |
Total |  | $ | 16 |  |  | $ | 15 |  |  | $ | 15 |  |  |
(1) Data presented for these calendar years is required supplemental information, which is unaudited.
Workers' Compensation | Commercial |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 601 |  |  | $ | 627 |  |  | $ | 659 |  |  | $ | 669 |  |  | $ | 678 |  |  | $ | 673 |  |  | $ | 671 |  |  | $ | 668 |  |  | $ | 663 |  |  | $ | 664 |  |  | $ | 66 |  |  | 42,804 |
2013 |  |  | 537 |  |  | 572 |  |  | 592 |  |  | 618 |  |  | 593 |  |  | 582 |  |  | 561 |  |  | 552 |  |  | 548 |  |  | 91 |  |  | 38,867 |
2014 |  |  |  |  | 467 |  |  | 480 |  |  | 479 |  |  | 452 |  |  | 450 |  |  | 446 |  |  | 439 |  |  | 448 |  |  | 105 |  |  | 33,502 |
2015 |  |  |  |  |  |  | 422 |  |  | 431 |  |  | 406 |  |  | 408 |  |  | 394 |  |  | 382 |  |  | 372 |  |  | 101 |  |  | 31,894 |
2016 |  |  |  |  |  |  |  |  | 426 |  |  | 405 |  |  | 396 |  |  | 382 |  |  | 366 |  |  | 355 |  |  | 104 |  |  | 31,981 |
2017 |  |  |  |  |  |  |  |  |  |  | 440 |  |  | 432 |  |  | 421 |  |  | 400 |  |  | 402 |  |  | 92 |  |  | 33,121 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 450 |  |  | 440 |  |  | 428 |  |  | 415 |  |  | 104 |  |  | 34,851 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452 |  |  | 449 |  |  | 437 |  |  | 134 |  |  | 34,248 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 477 |  |  | 466 |  |  | 228 |  |  | 29,188 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 468 |  |  | 300 |  |  | 25,711 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 4,575 |  |  | $ | 1,325 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 87 |  |  | $ | 232 |  |  | $ | 342 |  |  | $ | 416 |  |  | $ | 470 |  |  | $ | 509 |  |  | $ | 524 |  |  | $ | 536 |  |  | $ | 538 |  |  | $ | 541 |
2013 |  |  | 80 |  |  | 213 |  |  | 300 |  |  | 370 |  |  | 417 |  |  | 419 |  |  | 411 |  |  | 414 |  |  | 417 |
2014 |  |  |  |  | 61 |  |  | 159 |  |  | 215 |  |  | 258 |  |  | 282 |  |  | 290 |  |  | 297 |  |  | 306 |
2015 |  |  |  |  |  |  | 51 |  |  | 131 |  |  | 180 |  |  | 212 |  |  | 231 |  |  | 243 |  |  | 251 |
2016 |  |  |  |  |  |  |  |  | 53 |  |  | 129 |  |  | 169 |  |  | 198 |  |  | 219 |  |  | 227 |
2017 |  |  |  |  |  |  |  |  |  |  | 63 |  |  | 151 |  |  | 207 |  |  | 243 |  |  | 265 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 68 |  |  | 163 |  |  | 229 |  |  | 259 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71 |  |  | 169 |  |  | 223 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65 |  |  | 147 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 2,703 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 1,872 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 1,941 |
Other (2) |  | (14) |
Liability for unallocated claim adjustment expenses for accident years presented |  | 51 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 3,850 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 26 |  |  | $ | 32 |  |  | $ | 10 |  |  | $ | 9 |  |  | $ | (5) |  |  | $ | (2) |  |  | $ | (3) |  |  | $ | (5) |  |  | $ | 1 |  |  | $ | 63 |
2013 |  |  |  |  | 35 |  |  | 20 |  |  | 26 |  |  | (25) |  |  | (11) |  |  | (21) |  |  | (9) |  |  | (4) |  |  | 11 |
2014 |  |  |  |  |  |  | 13 |  |  | (1) |  |  | (27) |  |  | (2) |  |  | (4) |  |  | (7) |  |  | 9 |  |  | (19) |
2015 |  |  |  |  |  |  |  |  | 9 |  |  | (25) |  |  | 2 |  |  | (14) |  |  | (12) |  |  | (10) |  |  | (50) |
2016 |  |  |  |  |  |  |  |  |  |  | (21) |  |  | (9) |  |  | (14) |  |  | (16) |  |  | (11) |  |  | (71) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | (8) |  |  | (11) |  |  | (21) |  |  | 2 |  |  | (38) |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) |  |  | (12) |  |  | (13) |  |  | (35) |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |  |  | (12) |  |  | (15) |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11) |  |  | (11) |
Total net development for the accident years presented above |  | (77) |  |  | (85) |  |  | (49) |  |  |
Adjustment for development on a discounted basis |  | 3 |  |  | 2 |  |  | 2 |  |  |
Total net development for accident years prior to 2012 |  | 38 |  |  | (13) |  |  | (35) |  |  |
Total unallocated claim adjustment expense development |  | 23 |  |  | — |  |  | — |  |  |
Total |  | $ | (13) |  |  | $ | (96) |  |  | $ | (82) |  |  |
(1) Data presented for these calendar years is required supplemental information, which is unaudited. (2) Other includes the effect of discounting lifetime claim reserves.
Excluding Hardy | International |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Short-duration contracts net incurred claims and allocated claim adjustment expenses | Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year |  | As of December 31, 2021
(In millions, except reported claims data) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | IBNR |  | Cumulative Number of Claims
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 278 |  |  | $ | 285 |  |  | $ | 269 |  |  | $ | 262 |  |  | $ | 261 |  |  | $ | 254 |  |  | $ | 247 |  |  | $ | 241 |  |  | $ | 236 |  |  | $ | 250 |  |  | $ | 16 |  |  | 24,998 |
2013 |  |  | 285 |  |  | 301 |  |  | 293 |  |  | 273 |  |  | 269 |  |  | 260 |  |  | 251 |  |  | 247 |  |  | 251 |  |  | 12 |  |  | 23,967 |
2014 |  |  |  |  | 288 |  |  | 303 |  |  | 303 |  |  | 291 |  |  | 283 |  |  | 300 |  |  | 301 |  |  | 294 |  |  | 16 |  |  | 24,946 |
2015 |  |  |  |  |  |  | 301 |  |  | 317 |  |  | 316 |  |  | 298 |  |  | 292 |  |  | 294 |  |  | 297 |  |  | 27 |  |  | 23,357 |
2016 |  |  |  |  |  |  |  |  | 296 |  |  | 315 |  |  | 300 |  |  | 297 |  |  | 287 |  |  | 302 |  |  | 37 |  |  | 17,776 |
2017 |  |  |  |  |  |  |  |  |  |  | 312 |  |  | 378 |  |  | 401 |  |  | 393 |  |  | 388 |  |  | 84 |  |  | 18,470 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 384 |  |  | 402 |  |  | 407 |  |  | 406 |  |  | 81 |  |  | 20,726 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 357 |  |  | 371 |  |  | 368 |  |  | 91 |  |  | 17,974 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 398 |  |  | 389 |  |  | 184 |  |  | 13,909 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 426 |  |  | 297 |  |  | 10,401 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 3,371 |  |  | $ | 845 |  |  |
Short-duration contracts net cumulative paid claim adjustment expenses reconciliation of total liability for unpaid claim and claim adjustment expense | Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table.
As of December 31 | Calendar Year
(In millions) | 2012(1) |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | $ | 46 |  |  | $ | 117 |  |  | $ | 151 |  |  | $ | 172 |  |  | $ | 188 |  |  | $ | 200 |  |  | $ | 210 |  |  | $ | 213 |  |  | $ | 215 |  |  | $ | 218 |
2013 |  |  | 51 |  |  | 116 |  |  | 144 |  |  | 161 |  |  | 176 |  |  | 186 |  |  | 206 |  |  | 218 |  |  | 224 |
2014 |  |  |  |  | 54 |  |  | 126 |  |  | 154 |  |  | 173 |  |  | 190 |  |  | 211 |  |  | 245 |  |  | 250 |
2015 |  |  |  |  |  |  | 58 |  |  | 137 |  |  | 168 |  |  | 189 |  |  | 213 |  |  | 228 |  |  | 239 |
2016 |  |  |  |  |  |  |  |  | 68 |  |  | 136 |  |  | 164 |  |  | 188 |  |  | 200 |  |  | 223 |
2017 |  |  |  |  |  |  |  |  |  |  | 67 |  |  | 152 |  |  | 193 |  |  | 223 |  |  | 247 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  | 94 |  |  | 173 |  |  | 221 |  |  | 252 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76 |  |  | 171 |  |  | 209 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 |  |  | 133 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58 |
Total |  | $ | 2,053 |
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented |  | $ | 1,318 |
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2012 |  | 47 |
Liability for unallocated claim adjustment expenses for accident years presented |  | 35 |
Total net liability for unpaid claim and claim adjustment expenses |  | $ | 1,400 |
Short-duration contracts reserve development | Net strengthening (releases) of prior accident year reserves is presented in the following table.
For the years ended December 31 |  | Calendar Year |  |
(In millions) |  |  | 2013(1) |  | 2014(1) |  | 2015(1) |  | 2016(1) |  | 2017(1) |  | 2018(1) |  | 2019(1) |  | 2020(1) |  | 2021 |  | Total (2)
Accident Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  | $ | 7 |  |  | $ | (16) |  |  | $ | (7) |  |  | $ | (1) |  |  | $ | (7) |  |  | $ | (7) |  |  | $ | (6) |  |  | $ | (5) |  |  | $ | 14 |  |  | $ | (28) |
2013 |  |  |  |  | 16 |  |  | (8) |  |  | (20) |  |  | (4) |  |  | (9) |  |  | (9) |  |  | (4) |  |  | 4 |  |  | (34) |
2014 |  |  |  |  |  |  | 15 |  |  | — |  |  | (12) |  |  | (8) |  |  | 17 |  |  | 1 |  |  | (7) |  |  | 6 |
2015 |  |  |  |  |  |  |  |  | 16 |  |  | (1) |  |  | (18) |  |  | (6) |  |  | 2 |  |  | 3 |  |  | (4) |
2016 |  |  |  |  |  |  |  |  |  |  | 19 |  |  | (15) |  |  | (3) |  |  | (10) |  |  | 15 |  |  | 6 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  | 66 |  |  | 23 |  |  | (8) |  |  | (5) |  |  | 76 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  | 5 |  |  | (1) |  |  | 22 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  | (3) |  |  | 11 |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) |  |  | (9) |
(1) Data presented for these calendar years is required supplemental information, which is unaudited. (2) The amounts included in the loss reserve development tables above are presented at the year-end 2021 foreign currency exchange rates for all periods presented to remove the effects of foreign currency exchange rate fluctuations between calendar years. The amounts included within the table on page 101 presenting the detail of the development recorded within the International segment include the impact of fluctuations in foreign currency exchange rates.

X
- Definition Gross and net carried claim and claim adjustment expense reserves [Table Text Block] + References No definition available. + Details
Name: | cna_GrossAndNetCarriedClaimAndClaimAdjustmentExpenseReservesTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impact of the loss portfolio transfer on the consolidated statements of operations + References No definition available. + Details
Name: | cna_ImpactOfLossPortfolioTransferOnConsolidatedStatementsOfOperationsTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Net Incurred Claim and Claim Adjustment Expense [Table] + References No definition available. + Details
Name: | cna_NetIncurredClaimandClaimAdjustmentExpenseLineItems
Namespace Prefix: | cna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pretax Favorable Unfavorable Net Prior Year Claim And Allocated Claim Adjustment Expense Reserve Development [Table Text Block] + References No definition available. + Details
Name: | cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveAndPremiumDevelopmentTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net prior year claim and allocated claim adjustment expense reserve development + References No definition available. + Details
Name: | cna_NetprioryearclaimandallocatedclaimadjustmentexpensereservedevelopmentTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short-Duration Contracts Net Cumulative Paid Claim Adjustment Expenses Reconciliation of Total Liability for Unpaid Claim and Claim Adjustment Expense [Table Text Block] + References No definition available. + Details
Name: | cna_ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesReconciliationofTotalLiabilityforUnpaidClaimandClaimAdjustmentExpenseTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short-Duration Contracts Net Incurred Claims and Allocated Claim Adjustment Expenses [Table Text Block] + References No definition available. + Details
Name: | cna_ShortDurationContractsNetIncurredClaimsandAllocatedClaimAdjustmentExpensesTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short-Duration Contracts Reserve Development [Table Text Block] + References No definition available. + Details
Name: | cna_ShortDurationContractsReserveDevelopmentTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
Name: | us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for the reconciliation of claims development to the liability for unpaid claims and claim adjustment expense for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671315-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsReconciliationOfClaimsDevelopmentToLiabilityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of average annual percentage payout of incurred claims by age, after reinsurance, for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671329-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsScheduleOfHistoricalClaimsDurationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_SpecialtySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_CommercialSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_InternationalSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_CNAFConsolidatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_HardyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_MedicalProfessionalLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_OtherProfessionalLiabilityandManagementLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_SuretyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_CommercialAutoProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_GeneralLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_WorkersCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cna_ExcludingHardyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |