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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 70,790 |  | $ 64,977 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 916 |  | 1,125 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5,784 |  | 5,560 |
Fixed maturity securities, available-for-sale | $ 65,827 | [1] | $ 60,467 | [2]
% of Total | 100.00% |  | 100.00% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 95 |  | $ 75 |
Corporate Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 44,575 |  | 42,014 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 485 |  | 554 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,933 |  | 3,751 |
Fixed maturity securities, available-for-sale | $ 41,048 | [1] | $ 38,755 | [2]
% of Total | 62.40% |  | 64.10% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 79 |  | $ 62 |
Canadian and Canadian provincial governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 3,455 |  | 3,477 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 326 |  | 473 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 68 |  | 33 |
Fixed maturity securities, available-for-sale | $ 3,713 | [1] | $ 3,917 | [2]
% of Total | 5.60% |  | 6.50% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
Residential mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,250 |  | 1,173 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10 |  | 8 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 110 |  | 102 |
Fixed maturity securities, available-for-sale | $ 1,150 | [1] | $ 1,079 | [2]
% of Total | 1.70% |  | 1.80% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
Asset-backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 5,137 |  | 4,661 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 30 |  | 19 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 207 |  | 239 |
Fixed maturity securities, available-for-sale | $ 4,945 | [1] | $ 4,429 | [2]
% of Total | 7.50% |  | 7.30% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 15 |  | $ 12 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 2,002 |  | 1,969 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 14 |  | 7 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 154 |  | 202 |
Fixed maturity securities, available-for-sale | $ 1,861 | [1] | $ 1,773 | [2]
% of Total | 2.80% |  | 2.90% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 1 |  | $ 1 |
US Treasury and Government [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 3,028 |  | 2,725 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 |  | 9 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 244 |  | 214 |
Fixed maturity securities, available-for-sale | $ 2,786 | [1] | $ 2,520 | [2]
% of Total | 4.20% |  | 4.20% |
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] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,249 |  | 1,236 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 |  | 7 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 139 |  | 129 |
Fixed maturity securities, available-for-sale | $ 1,116 | [1] | $ 1,114 | [2]
% of Total | 1.70% |  | 1.80% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
Debt Security, Government, Non-US [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 4,372 |  | 4,092 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 39 |  | 45 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 407 |  | 388 |
Fixed maturity securities, available-for-sale | $ 4,004 | [1] | $ 3,749 | [2]
% of Total | 6.20% |  | 6.20% |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0 |
JAPAN |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 5,722 |  | 3,630 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 3 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 522 |  | 502 |
Fixed maturity securities, available-for-sale | $ 5,204 |  | $ 3,131 |
% of Total | 7.90% |  | 5.20% |
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 March 31, 2024, the fair value of such investments was $893 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, 2023, the fair value of such investments was $856 million

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