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Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Debt securities Available for sale |
December 31, 2019 | Amortized Cost |  |  | Gross Unrealized Appreciation |  |  | Gross Unrealized Depreciation |  |  | Fair Value |  |  | OTTI Recognized in AOCI |
(in millions of U.S. dollars) |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 3,188 |  |  | $ | 96 |  |  | $ | (1 | ) |  | $ | 3,283 |  |  | $ | — |
Foreign | 22,670 |  |  | 1,099 |  |  | (62 | ) |  | 23,707 |  |  | (25 | )
Corporate securities | 30,689 |  |  | 1,180 |  |  | (78 | ) |  | 31,791 |  |  | (5 | )
Mortgage-backed securities | 18,712 |  |  | 494 |  |  | (14 | ) |  | 19,192 |  |  | — |
States, municipalities, and political subdivisions | 7,321 |  |  | 205 |  |  | (11 | ) |  | 7,515 |  |  | — |
| $ | 82,580 |  |  | $ | 3,074 |  |  | $ | (166 | ) |  | $ | 85,488 |  |  | $ | (30 | )
Held to maturity |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 1,318 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 1,347 |  |  | $ | — |
Foreign | 1,423 |  |  | 62 |  |  | — |  |  | 1,485 |  |  | — |
Corporate securities | 2,349 |  |  | 121 |  |  | (2 | ) |  | 2,468 |  |  | — |
Mortgage-backed securities | 2,331 |  |  | 65 |  |  | — |  |  | 2,396 |  |  | — |
States, municipalities, and political subdivisions | 5,160 |  |  | 150 |  |  | (1 | ) |  | 5,309 |  |  | — |
| $ | 12,581 |  |  | $ | 427 |  |  | $ | (3 | ) |  | $ | 13,005 |  |  | $ | — |
December 31, 2018 | Amortized Cost |  |  | Gross Unrealized Appreciation |  |  | Gross Unrealized Depreciation |  |  | Fair Value |  |  | OTTI Recognized in AOCI |
(in millions of U.S. dollars) |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 4,158 |  |  | $ | 30 |  |  | $ | (43 | ) |  | $ | 4,145 |  |  | $ | — |
Foreign | 21,370 |  |  | 395 |  |  | (349 | ) |  | 21,416 |  |  | — |
Corporate securities | 27,183 |  |  | 150 |  |  | (750 | ) |  | 26,583 |  |  | (6 | )
Mortgage-backed securities | 15,758 |  |  | 66 |  |  | (284 | ) |  | 15,540 |  |  | (1 | )
States, municipalities, and political subdivisions | 10,854 |  |  | 49 |  |  | (117 | ) |  | 10,786 |  |  | — |
| $ | 79,323 |  |  | $ | 690 |  |  | $ | (1,543 | ) |  | $ | 78,470 |  |  | $ | (7 | )
Held to maturity |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 1,185 |  |  | $ | 8 |  |  | $ | (11 | ) |  | $ | 1,182 |  |  | $ | — |
Foreign | 1,549 |  |  | 11 |  |  | (18 | ) |  | 1,542 |  |  | — |
Corporate securities | 2,601 |  |  | 11 |  |  | (104 | ) |  | 2,508 |  |  | — |
Mortgage-backed securities | 2,524 |  |  | 5 |  |  | (43 | ) |  | 2,486 |  |  | — |
States, municipalities, and political subdivisions | 5,576 |  |  | 16 |  |  | (51 | ) |  | 5,541 |  |  | — |
| $ | 13,435 |  |  | $ | 51 |  |  | $ | (227 | ) |  | $ | 13,259 |  |  | $ | — |
Debt Securities Held to Maturity |
December 31, 2019 | Amortized Cost |  |  | Gross Unrealized Appreciation |  |  | Gross Unrealized Depreciation |  |  | Fair Value |  |  | OTTI Recognized in AOCI |
(in millions of U.S. dollars) |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 3,188 |  |  | $ | 96 |  |  | $ | (1 | ) |  | $ | 3,283 |  |  | $ | — |
Foreign | 22,670 |  |  | 1,099 |  |  | (62 | ) |  | 23,707 |  |  | (25 | )
Corporate securities | 30,689 |  |  | 1,180 |  |  | (78 | ) |  | 31,791 |  |  | (5 | )
Mortgage-backed securities | 18,712 |  |  | 494 |  |  | (14 | ) |  | 19,192 |  |  | — |
States, municipalities, and political subdivisions | 7,321 |  |  | 205 |  |  | (11 | ) |  | 7,515 |  |  | — |
| $ | 82,580 |  |  | $ | 3,074 |  |  | $ | (166 | ) |  | $ | 85,488 |  |  | $ | (30 | )
Held to maturity |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 1,318 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 1,347 |  |  | $ | — |
Foreign | 1,423 |  |  | 62 |  |  | — |  |  | 1,485 |  |  | — |
Corporate securities | 2,349 |  |  | 121 |  |  | (2 | ) |  | 2,468 |  |  | — |
Mortgage-backed securities | 2,331 |  |  | 65 |  |  | — |  |  | 2,396 |  |  | — |
States, municipalities, and political subdivisions | 5,160 |  |  | 150 |  |  | (1 | ) |  | 5,309 |  |  | — |
| $ | 12,581 |  |  | $ | 427 |  |  | $ | (3 | ) |  | $ | 13,005 |  |  | $ | — |
December 31, 2018 | Amortized Cost |  |  | Gross Unrealized Appreciation |  |  | Gross Unrealized Depreciation |  |  | Fair Value |  |  | OTTI Recognized in AOCI |
(in millions of U.S. dollars) |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 4,158 |  |  | $ | 30 |  |  | $ | (43 | ) |  | $ | 4,145 |  |  | $ | — |
Foreign | 21,370 |  |  | 395 |  |  | (349 | ) |  | 21,416 |  |  | — |
Corporate securities | 27,183 |  |  | 150 |  |  | (750 | ) |  | 26,583 |  |  | (6 | )
Mortgage-backed securities | 15,758 |  |  | 66 |  |  | (284 | ) |  | 15,540 |  |  | (1 | )
States, municipalities, and political subdivisions | 10,854 |  |  | 49 |  |  | (117 | ) |  | 10,786 |  |  | — |
| $ | 79,323 |  |  | $ | 690 |  |  | $ | (1,543 | ) |  | $ | 78,470 |  |  | $ | (7 | )
Held to maturity |  |  |  |  |  |  |  |  |
U.S. Treasury and agency | $ | 1,185 |  |  | $ | 8 |  |  | $ | (11 | ) |  | $ | 1,182 |  |  | $ | — |
Foreign | 1,549 |  |  | 11 |  |  | (18 | ) |  | 1,542 |  |  | — |
Corporate securities | 2,601 |  |  | 11 |  |  | (104 | ) |  | 2,508 |  |  | — |
Mortgage-backed securities | 2,524 |  |  | 5 |  |  | (43 | ) |  | 2,486 |  |  | — |
States, municipalities, and political subdivisions | 5,576 |  |  | 16 |  |  | (51 | ) |  | 5,541 |  |  | — |
| $ | 13,435 |  |  | $ | 51 |  |  | $ | (227 | ) |  | $ | 13,259 |  |  | $ | — |
Schedule Of Fixed Maturities By Contractual Maturity | The following table presents fixed maturities by contractual maturity:
| December 31 |  |  | December 31 |
|  |  | 2019 |  |  |  |  | 2018 |
(in millions of U.S. dollars) | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Available for sale |  |  |  |  |  |  |
Due in 1 year or less | $ | 3,951 |  |  | $ | 3,973 |  |  | $ | 3,569 |  |  | $ | 3,568 |
Due after 1 year through 5 years | 27,142 |  |  | 27,720 |  |  | 27,134 |  |  | 27,005 |
Due after 5 years through 10 years | 23,901 |  |  | 24,874 |  |  | 24,095 |  |  | 23,543 |
Due after 10 years | 8,874 |  |  | 9,729 |  |  | 8,767 |  |  | 8,814 |
| 63,868 |  |  | 66,296 |  |  | 63,565 |  |  | 62,930 |
Mortgage-backed securities | 18,712 |  |  | 19,192 |  |  | 15,758 |  |  | 15,540 |
| $ | 82,580 |  |  | $ | 85,488 |  |  | $ | 79,323 |  |  | $ | 78,470 |
Held to maturity |  |  |  |  |  |  |
Due in 1 year or less | $ | 478 |  |  | $ | 479 |  |  | $ | 536 |  |  | $ | 537 |
Due after 1 year through 5 years | 3,869 |  |  | 3,940 |  |  | 3,122 |  |  | 3,106 |
Due after 5 years through 10 years | 3,756 |  |  | 3,883 |  |  | 4,468 |  |  | 4,407 |
Due after 10 years | 2,147 |  |  | 2,307 |  |  | 2,785 |  |  | 2,723 |
| 10,250 |  |  | 10,609 |  |  | 10,911 |  |  | 10,773 |
Mortgage-backed securities | 2,331 |  |  | 2,396 |  |  | 2,524 |  |  | 2,486 |
| $ | 12,581 |  |  | $ | 13,005 |  |  | $ | 13,435 |  |  | $ | 13,259 |
Schedule Of Default Assumptions By Moody's Rating Category | The following table presents default assumptions by Moody's rating category (historical mean default rate provided for comparison):
| Investment Grade |  | Below Investment Grade |
| Aaa-Baa |  | Ba |  |  | B |  |  | Caa-C |
1-in-100 Year Default Rate | 0.0 - 1.3% |  | 4.8 | % |  | 12.0 | % |  | 36.3 | %
Historical Mean Default Rate | 0.0 - 0.3% |  | 1.0 | % |  | 3.1 | % |  | 10.4 | %
Schedule Of Net Realized Gains (Losses) And The Losses Included In Net Realized Gains (Losses) And OCI | The following table presents the components of Net realized gains (losses) and the change in net unrealized appreciation (depreciation) of investments:
| Year Ended December 31 |
(in millions of U.S. dollars) | 2019 |  |  | 2018 |  |  | 2017 |
Fixed maturities: |  |  |  |  |
OTTI on fixed maturities, gross | $ | (90 | ) |  | $ | (52 | ) |  | $ | (24 | )
OTTI on fixed maturities recognized in OCI (pre-tax) | 32 |  |  | 3 |  |  | 1 |
OTTI on fixed maturities, net | (58 | ) |  | (49 | ) |  | (23 | )
Gross realized gains excluding OTTI | 203 |  |  | 334 |  |  | 149 |
Gross realized losses excluding OTTI | (176 | ) |  | (587 | ) |  | (157 | )
Total fixed maturities | (31 | ) |  | (302 | ) |  | (31 | )
Equity securities (1) | 104 |  |  | (59 | ) |  | 16 |
OTTI on other investments | — |  |  | — |  |  | (12 | )
Other investments | (20 | ) |  | (5 | ) |  | — |
Foreign exchange gains | 7 |  |  | 131 |  |  | 36 |
Investment and embedded derivative instruments | (435 | ) |  | (75 | ) |  | (11 | )
Fair value adjustments on insurance derivative | (4 | ) |  | (248 | ) |  | 364 |
S&P futures | (138 | ) |  | (4 | ) |  | (261 | )
Other derivative instruments | (8 | ) |  | (3 | ) |  | (5 | )
Other | (5 | ) |  | (87 | ) |  | (12 | )
Net realized gains (losses) (pre-tax) | $ | (530 | ) |  | $ | (652 | ) |  | $ | 84 |
Change in net unrealized appreciation (depreciation) on investments (pre-tax): |  |  |  |  |
Fixed maturities available for sale | $ | 3,769 |  |  | $ | (1,958 | ) |  | $ | 519 |
Fixed maturities held to maturity | (31 | ) |  | (38 | ) |  | 18 |
Equity securities | — |  |  | — |  |  | 88 |
Other | (3 | ) |  | — |  |  | 8 |
Income tax (expense) benefit | (647 | ) |  | 297 |  |  | (241 | )
Change in net unrealized appreciation (depreciation) on investments (after-tax) | $ | 3,088 |  |  | $ | (1,699 | ) |  | $ | 392 |
Schedule Of Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which A Portion Of OTTI Was Recognized In OCI |
Schedule Of Other Investments |
| December 31 |
(in millions of U.S. dollars) | 2019 |  |  | 2018 |
Alternative investments: |  |  |
Partially-owned investment companies | $ | 4,142 |  |  | $ | 3,623 |
Limited partnerships | 508 |  |  | 538 |
Investment funds | 271 |  |  | 83 |
Alternative investments | 4,921 |  |  | 4,244 |
Life insurance policies | 377 |  |  | 304 |
Policy loans | 247 |  |  | 243 |
Non-qualified separate account assets (1) | 283 |  |  | 252 |
Other | 234 |  |  | 234 |
Total | $ | 6,062 |  |  | $ | 5,277 |
Schedule Of Partially Owned Insurance Companies |
| December 31, 2019 |  |  | December 31, 2018 |  |  |
(in millions of U.S. dollars, except for percentages) | Carrying Value |  |  | Direct Ownership Percentage |  |  | Carrying Value |  |  | Direct Ownership Percentage |  |  | Domicile
Huatai Group | $ | 1,053 |  |  | 31 | % |  | $ | 452 |  |  | 20 | % |  | China
Huatai Life Insurance Company | 147 |  |  | 20 | % |  | 106 |  |  | 20 | % |  | China
Freisenbruch-Meyer | 10 |  |  | 40 | % |  | 9 |  |  | 40 | % |  | Bermuda
Chubb Arabia Cooperative Insurance Company | 20 |  |  | 30 | % |  | 18 |  |  | 30 | % |  | Saudi Arabia
Russian Reinsurance Company | 2 |  |  | 23 | % |  | 2 |  |  | 23 | % |  | Russia
ABR Reinsurance Ltd. | 100 |  |  | 12 | % |  | 91 |  |  | 12 | % |  | Bermuda
Total | $ | 1,332 |  |  |  |  | $ | 678 |  |  |  |  |
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position | The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
| 0 – 12 Months |  |  | Over 12 Months |  |  | Total |
December 31, 2019 | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |
(in millions of U.S. dollars) |  |  |  |  |
U.S. Treasury and agency | $ | 234 |  |  | $ | (1 | ) |  | $ | 339 |  |  | $ | — |  |  | $ | 573 |  |  | $ | (1 | )
Foreign | 1,846 |  |  | (34 | ) |  | 802 |  |  | (28 | ) |  | 2,648 |  |  | (62 | )
Corporate securities | 2,121 |  |  | (40 | ) |  | 988 |  |  | (40 | ) |  | 3,109 |  |  | (80 | )
Mortgage-backed securities | 1,174 |  |  | (6 | ) |  | 932 |  |  | (8 | ) |  | 2,106 |  |  | (14 | )
States, municipalities, and political subdivisions | 188 |  |  | — |  |  | 276 |  |  | (12 | ) |  | 464 |  |  | (12 | )
Total fixed maturities | $ | 5,563 |  |  | $ | (81 | ) |  | $ | 3,337 |  |  | $ | (88 | ) |  | $ | 8,900 |  |  | $ | (169 | )
| 0 – 12 Months |  |  | Over 12 Months |  |  | Total |
December 31, 2018 | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |
(in millions of U.S. dollars) |  |  |  |  |
U.S. Treasury and agency | $ | 523 |  |  | $ | (4 | ) |  | $ | 2,859 |  |  | $ | (50 | ) |  | $ | 3,382 |  |  | $ | (54 | )
Foreign | 6,764 |  |  | (208 | ) |  | 5,349 |  |  | (159 | ) |  | 12,113 |  |  | (367 | )
Corporate securities | 16,538 |  |  | (599 | ) |  | 4,873 |  |  | (255 | ) |  | 21,411 |  |  | (854 | )
Mortgage-backed securities | 6,103 |  |  | (98 | ) |  | 6,913 |  |  | (229 | ) |  | 13,016 |  |  | (327 | )
States, municipalities, and political subdivisions | 5,024 |  |  | (44 | ) |  | 7,768 |  |  | (124 | ) |  | 12,792 |  |  | (168 | )
Total fixed maturities | $ | 34,952 |  |  | $ | (953 | ) |  | $ | 27,762 |  |  | $ | (817 | ) |  | $ | 62,714 |  |  | $ | (1,770 | )
Schedule Of Sources Of Net Investment Income |
| Year Ended December 31 |
(in millions of U.S. dollars) | 2019 |  |  | 2018 |  |  | 2017 |
Fixed maturities | $ | 3,385 |  |  | $ | 3,128 |  |  | $ | 2,987 |
Short-term investments | 84 |  |  | 90 |  |  | 56 |
Other interest income | 25 |  |  | 118 |  |  | 75 |
Equity securities | 26 |  |  | 33 |  |  | 38 |
Other investments | 78 |  |  | 104 |  |  | 133 |
Gross investment income (1) | 3,598 |  |  | 3,473 |  |  | 3,289 |
Investment expenses | (172 | ) |  | (168 | ) |  | (164 | )
Net investment income (1) | $ | 3,426 |  |  | $ | 3,305 |  |  | $ | 3,125 |
(1) Includes amortization expense related to fair value adjustment of acquired invested assets related to the Chubb Corp acquisition | $ | (161 | ) |  | $ | (248 | ) |  | $ | (332 | )
Schedule Of Components Of Restricted Assets | The following table presents the components of restricted assets:
| December 31 |  |  | December 31 |
(in millions of U.S. dollars) | 2019 |  |  | 2018 |
Trust funds | $ | 14,004 |  |  | $ | 13,988 |
Deposits with U.S. regulatory authorities | 2,466 |  |  | 2,405 |
Deposits with non-U.S. regulatory authorities | 2,709 |  |  | 2,531 |
Assets pledged under repurchase agreements | 1,464 |  |  | 1,468 |
Other pledged assets | 490 |  |  | 692 |
Total | $ | 21,133 |  |  | $ | 21,084 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] | The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments:
|  |  | December 31 |  |  | December 31 |
|  |  | 2019 |  |  | 2018 |
(in millions of U.S. dollars) | Expected Liquidation Period of Underlying Assets |  | Fair Value |  |  | Maximum Future Funding Commitments |  |  | Fair Value |  |  | Maximum Future Funding Commitments |
Financial | 2 to 10 Years |  | $ | 611 |  |  | $ | 329 |  |  | $ | 596 |  |  | $ | 193 |
Real Assets | 2 to 11 Years |  | 712 |  |  | 422 |  |  | 704 |  |  | 362 |
Distressed | 2 to 7 Years |  | 263 |  |  | 80 |  |  | 296 |  |  | 105 |
Private Credit | 3 to 8 Years |  | 104 |  |  | 272 |  |  | 147 |  |  | 310 |
Traditional | 2 to 14 Years |  | 2,844 |  |  | 2,160 |  |  | 2,362 |  |  | 2,735 |
Vintage | 1 to 2 Years |  | 116 |  |  | — |  |  | 56 |  |  | — |
Investment funds | Not Applicable |  | 271 |  |  | — |  |  | 83 |  |  | — |
|  |  | $ | 4,921 |  |  | $ | 3,263 |  |  | $ | 4,244 |  |  | $ | 3,705 |

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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27340-111563 + Details
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- Definition Tabular disclosure of other investments not readily marketable, including, but not limited to, description of investment, fair value and value as measured by quoted price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710923&loc=d3e45360-110995 + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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