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Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Debt securities Available for sale |
December 31, 2020 | Amortized Cost |  | Valuation Allowance |  | Gross Unrealized Appreciation |  | Gross Unrealized Depreciation |  | Fair Value |  |
(in millions of U.S. dollars) |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury / Agency | $ | 2,471 |  |  | $ | — |  |  | $ | 199 |  |  | $ | — |  |  | $ | 2,670 |  |  |
Non-U.S. | 24,594 |  |  | (6) |  |  | 1,808 |  |  | (42) |  |  | 26,354 |  |  |
Corporate and asset-backed securities | 34,095 |  |  | (14) |  |  | 2,322 |  |  | (72) |  |  | 36,331 |  |  |
Mortgage-backed securities | 17,456 |  |  | — |  |  | 1,022 |  |  | (8) |  |  | 18,470 |  |  |
Municipal | 6,572 |  |  | — |  |  | 304 |  |  | (2) |  |  | 6,874 |  |  |
| $ | 85,188 |  |  | $ | (20) |  |  | $ | 5,655 |  |  | $ | (124) |  |  | $ | 90,699 |  |  |
| Amortized Cost |  | Valuation Allowance |  | Net Carrying Value |  | Gross Unrealized Appreciation |  | Gross Unrealized Depreciation |  | Fair Value
Held to maturity |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury / Agency | $ | 1,392 |  |  | $ | — |  |  | $ | 1,392 |  |  | $ | 60 |  |  | $ | — |  |  | $ | 1,452 |
Non-U.S. | 1,295 |  |  | (7) |  |  | 1,288 |  |  | 118 |  |  | (1) |  |  | 1,405 |
Corporate and asset-backed securities | 2,185 |  |  | (35) |  |  | 2,150 |  |  | 288 |  |  | — |  |  | 2,438 |
Mortgage-backed securities | 2,000 |  |  | (1) |  |  | 1,999 |  |  | 148 |  |  | (1) |  |  | 2,146 |
Municipal | 4,825 |  |  | (1) |  |  | 4,824 |  |  | 245 |  |  | — |  |  | 5,069 |
| $ | 11,697 |  |  | $ | (44) |  |  | $ | 11,653 |  |  | $ | 859 |  |  | $ | (2) |  |  | $ | 12,510 |
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 / Agency | $ | 3,188 |  |  | $ | 96 |  |  | $ | (1) |  |  | $ | 3,283 |  |  | $ | — |
Non-U.S. | 22,670 |  |  | 1,099 |  |  | (62) |  |  | 23,707 |  |  | (25) |
Corporate and asset-backed securities | 30,689 |  |  | 1,180 |  |  | (78) |  |  | 31,791 |  |  | (5) |
Mortgage-backed securities | 18,712 |  |  | 494 |  |  | (14) |  |  | 19,192 |  |  | — |
Municipal | 7,321 |  |  | 205 |  |  | (11) |  |  | 7,515 |  |  | — |
| $ | 82,580 |  |  | $ | 3,074 |  |  | $ | (166) |  |  | $ | 85,488 |  |  | $ | (30) |
Held to maturity |  |  |  |  |  |  |  |  |
U.S. Treasury / Agency | $ | 1,318 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 1,347 |  |  | $ | — |
Non-U.S. | 1,423 |  |  | 62 |  |  | — |  |  | 1,485 |  |  | — |
Corporate and asset-backed securities | 2,349 |  |  | 121 |  |  | (2) |  |  | 2,468 |  |  | — |
Mortgage-backed securities | 2,331 |  |  | 65 |  |  | — |  |  | 2,396 |  |  | — |
Municipal | 5,160 |  |  | 150 |  |  | (1) |  |  | 5,309 |  |  | — |
| $ | 12,581 |  |  | $ | 427 |  |  | $ | (3) |  |  | $ | 13,005 |  |  | $ | — |
Debt Securities Held to Maturity |
December 31, 2020 | Amortized Cost |  | Valuation Allowance |  | Gross Unrealized Appreciation |  | Gross Unrealized Depreciation |  | Fair Value |  |
(in millions of U.S. dollars) |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury / Agency | $ | 2,471 |  |  | $ | — |  |  | $ | 199 |  |  | $ | — |  |  | $ | 2,670 |  |  |
Non-U.S. | 24,594 |  |  | (6) |  |  | 1,808 |  |  | (42) |  |  | 26,354 |  |  |
Corporate and asset-backed securities | 34,095 |  |  | (14) |  |  | 2,322 |  |  | (72) |  |  | 36,331 |  |  |
Mortgage-backed securities | 17,456 |  |  | — |  |  | 1,022 |  |  | (8) |  |  | 18,470 |  |  |
Municipal | 6,572 |  |  | — |  |  | 304 |  |  | (2) |  |  | 6,874 |  |  |
| $ | 85,188 |  |  | $ | (20) |  |  | $ | 5,655 |  |  | $ | (124) |  |  | $ | 90,699 |  |  |
| Amortized Cost |  | Valuation Allowance |  | Net Carrying Value |  | Gross Unrealized Appreciation |  | Gross Unrealized Depreciation |  | Fair Value
Held to maturity |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury / Agency | $ | 1,392 |  |  | $ | — |  |  | $ | 1,392 |  |  | $ | 60 |  |  | $ | — |  |  | $ | 1,452 |
Non-U.S. | 1,295 |  |  | (7) |  |  | 1,288 |  |  | 118 |  |  | (1) |  |  | 1,405 |
Corporate and asset-backed securities | 2,185 |  |  | (35) |  |  | 2,150 |  |  | 288 |  |  | — |  |  | 2,438 |
Mortgage-backed securities | 2,000 |  |  | (1) |  |  | 1,999 |  |  | 148 |  |  | (1) |  |  | 2,146 |
Municipal | 4,825 |  |  | (1) |  |  | 4,824 |  |  | 245 |  |  | — |  |  | 5,069 |
| $ | 11,697 |  |  | $ | (44) |  |  | $ | 11,653 |  |  | $ | 859 |  |  | $ | (2) |  |  | $ | 12,510 |
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 / Agency | $ | 3,188 |  |  | $ | 96 |  |  | $ | (1) |  |  | $ | 3,283 |  |  | $ | — |
Non-U.S. | 22,670 |  |  | 1,099 |  |  | (62) |  |  | 23,707 |  |  | (25) |
Corporate and asset-backed securities | 30,689 |  |  | 1,180 |  |  | (78) |  |  | 31,791 |  |  | (5) |
Mortgage-backed securities | 18,712 |  |  | 494 |  |  | (14) |  |  | 19,192 |  |  | — |
Municipal | 7,321 |  |  | 205 |  |  | (11) |  |  | 7,515 |  |  | — |
| $ | 82,580 |  |  | $ | 3,074 |  |  | $ | (166) |  |  | $ | 85,488 |  |  | $ | (30) |
Held to maturity |  |  |  |  |  |  |  |  |
U.S. Treasury / Agency | $ | 1,318 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 1,347 |  |  | $ | — |
Non-U.S. | 1,423 |  |  | 62 |  |  | — |  |  | 1,485 |  |  | — |
Corporate and asset-backed securities | 2,349 |  |  | 121 |  |  | (2) |  |  | 2,468 |  |  | — |
Mortgage-backed securities | 2,331 |  |  | 65 |  |  | — |  |  | 2,396 |  |  | — |
Municipal | 5,160 |  |  | 150 |  |  | (1) |  |  | 5,309 |  |  | — |
| $ | 12,581 |  |  | $ | 427 |  |  | $ | (3) |  |  | $ | 13,005 |  |  | $ | — |
Debt Securities, Held-to-maturity, Credit Quality Indicator | The following table presents the amortized cost of our HTM securities according to S&P rating:
December 31, 2020 |
(in millions of U.S. dollars) | Amortized cost |  | % of Total
AAA | $ | 2,511 |  |  | 22 | %
AA | 6,193 |  |  | 53 | %
A | 2,138 |  |  | 18 | %
BBB | 826 |  |  | 7 | %
BB | 28 |  |  | — | %
Other | 1 |  |  | — | %
Total | $ | 11,697 |  |  | 100 | %
Schedule Of Fixed Maturities By Contractual Maturity | The following table presents fixed maturities by contractual maturity:
| December 31 |  | December 31
|  |  | 2020 |  |  |  | 2019 |
(in millions of U.S. dollars) | Net Carrying Value |  | Fair Value |  | Amortized Cost |  | Fair Value
Available for sale |  |  |  |  |  |  |
Due in 1 year or less | $ | 4,760 |  |  | $ | 4,760 |  |  | $ | 3,951 |  |  | $ | 3,973 |
Due after 1 year through 5 years | 26,227 |  |  | 26,227 |  |  | 27,142 |  |  | 27,720 |
Due after 5 years through 10 years | 27,232 |  |  | 27,232 |  |  | 23,901 |  |  | 24,874 |
Due after 10 years | 14,010 |  |  | 14,010 |  |  | 8,874 |  |  | 9,729 |
| 72,229 |  |  | 72,229 |  |  | 63,868 |  |  | 66,296 |
Mortgage-backed securities | 18,470 |  |  | 18,470 |  |  | 18,712 |  |  | 19,192 |
| $ | 90,699 |  |  | $ | 90,699 |  |  | $ | 82,580 |  |  | $ | 85,488 |
Held to maturity |  |  |  |  |  |  |
Due in 1 year or less | $ | 1,231 |  |  | $ | 1,240 |  |  | $ | 478 |  |  | $ | 479 |
Due after 1 year through 5 years | 3,592 |  |  | 3,760 |  |  | 3,869 |  |  | 3,940 |
Due after 5 years through 10 years | 3,029 |  |  | 3,228 |  |  | 3,756 |  |  | 3,883 |
Due after 10 years | 1,802 |  |  | 2,136 |  |  | 2,147 |  |  | 2,307 |
| 9,654 |  |  | 10,364 |  |  | 10,250 |  |  | 10,609 |
Mortgage-backed securities | 1,999 |  |  | 2,146 |  |  | 2,331 |  |  | 2,396 |
| $ | 11,653 |  |  | $ | 12,510 |  |  | $ | 12,581 |  |  | $ | 13,005 |
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 table presents, for AFS fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have credit losses, 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, 2020 | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
(in millions of U.S. dollars) |  |  |  |  |
Non-U.S. | $ | 1,628 |  |  | $ | (35) |  |  | $ | 114 |  |  | $ | (5) |  |  | $ | 1,742 |  |  | $ | (40) |
Corporate and asset-backed securities | 2,212 |  |  | (33) |  |  | 593 |  |  | (14) |  |  | 2,805 |  |  | (47) |
Mortgage-backed securities | 875 |  |  | (6) |  |  | 35 |  |  | (2) |  |  | 910 |  |  | (8) |
Municipal | 40 |  |  | (1) |  |  | 16 |  |  | (1) |  |  | 56 |  |  | (2) |
Total AFS fixed maturities | $ | 4,755 |  |  | $ | (75) |  |  | $ | 758 |  |  | $ | (22) |  |  | $ | 5,513 |  |  | $ | (97) |
The following table presents, 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 / Agency | $ | 234 |  |  | $ | (1) |  |  | $ | 339 |  |  | $ | — |  |  | $ | 573 |  |  | $ | (1) |
Non-U.S. | 1,846 |  |  | (34) |  |  | 802 |  |  | (28) |  |  | 2,648 |  |  | (62) |
Corporate and asset-backed securities | 2,121 |  |  | (40) |  |  | 988 |  |  | (40) |  |  | 3,109 |  |  | (80) |
Mortgage-backed securities | 1,174 |  |  | (6) |  |  | 932 |  |  | (8) |  |  | 2,106 |  |  | (14) |
Municipal | 188 |  |  | — |  |  | 276 |  |  | (12) |  |  | 464 |  |  | (12) |
Total fixed maturities | $ | 5,563 |  |  | $ | (81) |  |  | $ | 3,337 |  |  | $ | (88) |  |  | $ | 8,900 |  |  | $ | (169) |
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) | 2020 |  | 2019 |  | 2018
Fixed maturities: |  |  |  |  |
OTTI on fixed maturities, gross | $ | — |  |  | $ | (90) |  |  | $ | (52) |
OTTI on fixed maturities recognized in OCI (pre-tax) | — |  |  | 32 |  |  | 3 |
OTTI on fixed maturities, net | — |  |  | (58) |  |  | (49) |
Gross realized gains excluding OTTI | 244 |  |  | 203 |  |  | 334 |
Gross realized losses excluding OTTI | (366) |  |  | (176) |  |  | (587) |
Recovery of expected credit losses | 11 |  |  | — |  |  | — |
Impairment (1) | (170) |  |  | — |  |  | — |
Total fixed maturities | (281) |  |  | (31) |  |  | (302) |
Equity securities | 586 |  |  | 104 |  |  | (59) |
Other investments | (32) |  |  | (20) |  |  | (5) |
Foreign exchange gains (losses) | (483) |  |  | 7 |  |  | 131 |
Investment and embedded derivative instruments | 81 |  |  | (435) |  |  | (75) |
Fair value adjustments on insurance derivative | (202) |  |  | (4) |  |  | (248) |
S&P futures | (108) |  |  | (138) |  |  | (4) |
Other derivative instruments | 1 |  |  | (8) |  |  | (3) |
Other | (60) |  |  | (5) |  |  | (87) |
Net realized gains (losses) (pre-tax) | $ | (498) |  |  | $ | (530) |  |  | $ | (652) |
Change in net unrealized appreciation (depreciation) on investments (pre-tax): |  |  |  |  |
Fixed maturities available for sale | $ | 2,628 |  |  | $ | 3,769 |  |  | $ | (1,958) |
Fixed maturities held to maturity | (24) |  |  | (31) |  |  | (38) |
Other | (12) |  |  | (3) |  |  | — |
Income tax (expense) benefit | (462) |  |  | (647) |  |  | 297 |
Change in net unrealized appreciation (depreciation) on investments (after-tax) | $ | 2,130 |  |  | $ | 3,088 |  |  | $ | (1,699) |
Gain (Loss) on Securities [Table Text Block] | Realized gains and losses from Equity securities and Other investments from the table above include sales of securities and unrealized gains and losses from fair value changes as follows:
| Year Ended December 31, 2020 |  | Year Ended December 31, 2019 |  | Year Ended December 31, 2018
(in millions of U.S. dollars) | Equity Securities |  | Other Investments |  | Total |  | Equity Securities |  | Other Investments |  | Total |  | Equity Securities |  | Other Investments |  | Total
Net gains (losses) recognized during the period | $ | 586 |  |  | $ | (32) |  |  | $ | 554 |  |  | $ | 104 |  |  | $ | (20) |  |  | $ | 84 |  |  | $ | (59) |  |  | $ | (5) |  |  | $ | (64) |
Less: Net gains (losses) recognized from sales of securities | 455 |  |  | — |  |  | 455 |  |  | 58 |  |  | (5) |  |  | 53 |  |  | 70 |  |  | 121 |  |  | 191 |
Unrealized gains (losses) recognized for securities still held at reporting date | $ | 131 |  |  | $ | (32) |  |  | $ | 99 |  |  | $ | 46 |  |  | $ | (15) |  |  | $ | 31 |  |  | $ | (129) |  |  | $ | (126) |  |  | $ | (255) |
Debt Securities, Available-for-sale, Allowance for Credit Loss | The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
| Year Ended
| December 31
(in millions of U.S. dollars) | 2020
Available for sale |
Valuation allowance for expected credit losses - beginning of period | $ | — |
Impact of adoption of new accounting guidance | 25 |
Provision for expected credit loss | 188 |
Initial allowance for purchased securities with credit deterioration | 5 |
Write-offs charged against the expected credit loss | (5) |
Recovery of expected credit loss | (193) |
Valuation allowance for expected credit losses - end of period | $ | 20 |
Held to maturity |
Valuation allowance for expected credit losses - beginning of period | $ | — |
Impact of adoption of new accounting guidance | 44 |
Provision for expected credit loss | 9 |
Recovery of expected credit loss | (9) |
Valuation allowance for expected credit losses - end of period | $ | 44 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
| Year Ended
| December 31
(in millions of U.S. dollars) | 2020
Available for sale |
Valuation allowance for expected credit losses - beginning of period | $ | — |
Impact of adoption of new accounting guidance | 25 |
Provision for expected credit loss | 188 |
Initial allowance for purchased securities with credit deterioration | 5 |
Write-offs charged against the expected credit loss | (5) |
Recovery of expected credit loss | (193) |
Valuation allowance for expected credit losses - end of period | $ | 20 |
Held to maturity |
Valuation allowance for expected credit losses - beginning of period | $ | — |
Impact of adoption of new accounting guidance | 44 |
Provision for expected credit loss | 9 |
Recovery of expected credit loss | (9) |
Valuation allowance for expected credit losses - end of period | $ | 44 |
Schedule Of Other Investments |
| December 31
(in millions of U.S. dollars) | 2020 |  | 2019
Alternative investments: |  |  |
Partially-owned investment companies | $ | 5,969 |  |  | $ | 4,142 |
Limited partnerships | 547 |  |  | 508 |
Investment funds | 254 |  |  | 271 |
Alternative investments | 6,770 |  |  | 4,921 |
Life insurance policies | 438 |  |  | 377 |
Policy loans | 233 |  |  | 247 |
Non-qualified separate account assets (1) | 316 |  |  | 283 |
Other | 188 |  |  | 234 |
Total | $ | 7,945 |  |  | $ | 6,062 |
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
|  |  | 2020 |  | 2019
(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 |  | $ | 673 |  |  | $ | 237 |  |  | $ | 611 |  |  | $ | 329 |
Real Assets | 2 to 11 Years |  | 805 |  |  | 598 |  |  | 712 |  |  | 422 |
Distressed | 2 to 8 Years |  | 358 |  |  | 970 |  |  | 263 |  |  | 80 |
Private Credit | 3 to 8 Years |  | 88 |  |  | 270 |  |  | 104 |  |  | 272 |
Traditional | 2 to 14 Years |  | 4,519 |  |  | 1,125 |  |  | 2,844 |  |  | 2,160 |
Vintage | 1 to 2 Years |  | 73 |  |  | — |  |  | 116 |  |  | — |
Investment funds | Not Applicable |  | 254 |  |  | — |  |  | 271 |  |  | — |
|  |  | $ | 6,770 |  |  | $ | 3,200 |  |  | $ | 4,921 |  |  | $ | 3,263 |
Schedule Of Sources Of Net Investment Income |
| Year Ended December 31
(in millions of U.S. dollars) | 2020 |  |  | 2019 |  |  | 2018 |
Fixed maturities (1) | $ | 3,321 |  |  | $ | 3,385 |  |  | $ | 3,128 |
Short-term investments | 48 |  |  | 84 |  |  | 90 |
Other interest income | 19 |  |  | 25 |  |  | 118 |
Equity securities | 81 |  |  | 26 |  |  | 33 |
Other investments | 82 |  |  | 78 |  |  | 104 |
Gross investment income (1) | 3,551 |  |  | 3,598 |  |  | 3,473 |
Investment expenses | (176) |  |  | (172) |  |  | (168) |
Net investment income (1) | $ | 3,375 |  |  | $ | 3,426 |  |  | $ | 3,305 |
(1) Includes amortization expense related to fair value adjustment of acquired invested assets related to the Chubb Corp acquisition | $ | (116) |  |  | $ | (161) |  |  | $ | (248) |
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) | 2020 |  | 2019
Trust funds | $ | 12,305 |  |  | $ | 14,004 |
Deposits with U.S. regulatory authorities | 2,438 |  |  | 2,466 |
Deposits with non-U.S. regulatory authorities | 2,905 |  |  | 2,709 |
Assets pledged under repurchase agreements | 1,462 |  |  | 1,464 |
Other pledged assets | 584 |  |  | 490 |
Total | $ | 19,694 |  |  | $ | 21,133 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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