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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 37 |  | $ 31 |
Available for Sale at Fair value - Amortized cost | 59,663 |  | 55,873 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 52,901 | [1] | $ 60,749 | [2]
Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 100.00% |  | 100.00% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 7,319 |  | $ 349 |
Available for Sale at Fair value - Amortized cost | 59,663 |  | 55,873 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 52,901 |  | 60,749 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 594 |  | 5,256 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 37 |  | 31 |
Corporate Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 38,963 |  | 35,239 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 33,969 | [1] | $ 38,103 | [2]
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 64.20% |  | 62.80% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 5,135 |  | $ 194 |
Available for Sale at Fair value - Amortized cost | 38,963 |  | 35,239 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 33,969 |  | 38,103 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 168 |  | 3,084 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 27 |  | 26 |
Canadian Provincial Governments [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 3,626 | [1] | $ 4,944 | [2]
Canadian Provincial Governments [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 6.90% |  | 8.10% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 66 |  | $ 1 |
Available for Sale at Fair value - Amortized cost | 3,311 |  | 3,339 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 3,626 |  | 4,944 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 381 |  | 1,606 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  | 0 |
Residential Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 941 | [1] | $ 1,050 | [2]
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 1.80% |  | 1.70% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 114 |  | $ 7 |
Available for Sale at Fair value - Amortized cost | 1,054 |  | 1,020 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 941 |  | 1,050 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 37 |
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 at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 3,878 | [1] | $ 4,005 | [2]
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 7.30% |  | 6.60% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 440 |  | $ 41 |
Available for Sale at Fair value - Amortized cost | 4,324 |  | 4,024 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 3,878 |  | 4,005 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 22 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 10 |  | 0 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 1,623 | [1] | $ 1,849 | [2]
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 3.10% |  | 3.00% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 212 |  | $ 6 |
Available for Sale at Fair value - Amortized cost | 1,835 |  | 1,790 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 1,623 |  | 1,849 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 66 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 |  | 1 |
US Treasury and Government [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 1,482 | [1] | $ 2,105 | [2]
US Treasury and Government [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 2.80% |  | 3.50% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 212 |  | $ 8 |
Available for Sale at Fair value - Amortized cost | 1,690 |  | 2,082 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 1,482 |  | 2,105 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 |  | 31 |
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 at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 1,119 | [1] | $ 1,323 | [2]
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 2.10% |  | 2.20% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 173 |  | $ 5 |
Available for Sale at Fair value - Amortized cost | 1,282 |  | 1,191 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 1,119 |  | 1,323 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10 |  | 137 |
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 at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 6,263 | [1] | $ 7,370 | [2]
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage Of Total Available For Sale Securities | 11.80% |  | 12.10% |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 967 |  | $ 87 |
Available for Sale at Fair value - Amortized cost | 7,204 |  | 7,188 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 6,263 |  | 7,370 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 26 |  | 273 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 4 |
[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 December 31, 2022, the fair value of such investments was $683 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, 2021, the fair value of such investments was $581 million.

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