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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 62,332 |  | $ 59,663 |
Fixed maturity securities, available-for-sale | 54,171 | [1] | 52,901 | [2]
Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 62,332 |  | 59,663 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 390 |  | 594 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8,483 |  | 7,319 |
Fixed maturity securities, available-for-sale | $ 54,171 |  | $ 52,901 |
% of Total | 100.00% |  | 100.00% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 68 |  | $ 37 |
Corporate Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 41,463 |  | 38,963 |
Fixed maturity securities, available-for-sale | $ 35,503 | [1] | $ 33,969 | [2]
% of Total | 100.00% |  | 100.00% |
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 41,463 |  | $ 38,963 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 170 |  | 168 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 6,075 |  | 5,135 |
Fixed maturity securities, available-for-sale | $ 35,503 |  | $ 33,969 |
% of Total | 65.50% |  | 64.20% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 55 |  | $ 27 |
Canadian and Canadian provincial governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 3,348 | [1] | 3,626 | [2]
Canadian and Canadian provincial governments | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 3,336 |  | 3,311 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 169 |  | 381 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 157 |  | 66 |
Fixed maturity securities, available-for-sale | $ 3,348 |  | $ 3,626 |
% of Total | 6.20% |  | 6.90% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
Residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 1,030 | [1] | 941 | [2]
Residential mortgage-backed securities | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,172 |  | 1,054 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 145 |  | 114 |
Fixed maturity securities, available-for-sale | $ 1,030 |  | $ 941 |
% of Total | 1.90% |  | 1.80% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
Asset-backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 4,236 | [1] | 3,878 | [2]
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 4,562 |  | 4,324 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 16 |  | 4 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 330 |  | 440 |
Fixed maturity securities, available-for-sale | $ 4,236 |  | $ 3,878 |
% of Total | 7.80% |  | 7.30% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 12 |  | $ 10 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 1,710 | [1] | 1,623 | [2]
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,959 |  | 1,835 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 250 |  | 212 |
Fixed maturity securities, available-for-sale | $ 1,710 |  | $ 1,623 |
% of Total | 3.20% |  | 3.10% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 1 |  | $ 0 |
US Treasury and Government [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 1,060 | [1] | 1,482 | [2]
US Treasury and Government [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,346 |  | 1,690 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 4 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 286 |  | 212 |
Fixed maturity securities, available-for-sale | $ 1,060 |  | $ 1,482 |
% of Total | 2.00% |  | 2.80% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 1,047 | [1] | 1,119 | [2]
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,242 |  | 1,282 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 10 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 199 |  | 173 |
Fixed maturity securities, available-for-sale | $ 1,047 |  | $ 1,119 |
% of Total | 1.90% |  | 2.10% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
Debt Security, Government, Non-US [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 3,522 | [1] | 3,704 | [2]
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 4,047 |  | 4,171 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 23 |  | 22 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 548 |  | 489 |
Fixed maturity securities, available-for-sale | $ 3,522 |  | $ 3,704 |
% of Total | 6.50% |  | 7.00% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
JAPAN | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 3,205 |  | 3,033 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 4 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 493 |  | 478 |
Fixed maturity securities, available-for-sale | $ 2,715 |  | $ 2,559 |
% of Total | 5.00% |  | 4.80% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of September 30, 2023, the fair value of such investments was $818 million.
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million

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