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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | $ 31,686 | $ 26,345
Less than 12 months Gross Unrealized Loss | $ 1,899 | $ 1,382
Total number of securities in an unrealized loss position less than 12 months | 3,607 | 2,922
Equal to or Greater than 12 Months Estimated Fair Value | $ 145,358 | $ 152,089
Equal to or Greater than 12 Months Gross Unrealized Loss | $ 26,175 | $ 24,394
Total number of securities in an unrealized loss position equal or greater than 12 months | 12,802 | 13,049
U.S. corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | $ 7,027 | $ 4,722
Less than 12 months Gross Unrealized Loss | 610 | 420
Equal to or Greater than 12 Months Estimated Fair Value | 44,051 | 45,373
Equal to or Greater than 12 Months Gross Unrealized Loss | 6,807 | 6,208
Foreign corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 3,456 | 3,210
Less than 12 months Gross Unrealized Loss | 153 | 187
Equal to or Greater than 12 Months Estimated Fair Value | 30,912 | 32,355
Equal to or Greater than 12 Months Gross Unrealized Loss | 5,666 | 5,240
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 4,967 | 3,913
Less than 12 months Gross Unrealized Loss | 419 | 246
Equal to or Greater than 12 Months Estimated Fair Value | 18,275 | 19,715
Equal to or Greater than 12 Months Gross Unrealized Loss | 4,352 | 4,187
U.S. government and agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 8,965 | 7,856
Less than 12 months Gross Unrealized Loss | 499 | 368
Equal to or Greater than 12 Months Estimated Fair Value | 14,810 | 13,960
Equal to or Greater than 12 Months Gross Unrealized Loss | 3,991 | 3,344
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 4,303 | 3,465
Less than 12 months Gross Unrealized Loss | 99 | 60
Equal to or Greater than 12 Months Estimated Fair Value | 17,123 | 17,128
Equal to or Greater than 12 Months Gross Unrealized Loss | 2,872 | 2,675
ABS & CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 1,807 | 1,662
Less than 12 months Gross Unrealized Loss | 30 | 31
Equal to or Greater than 12 Months Estimated Fair Value | 8,645 | 11,438
Equal to or Greater than 12 Months Gross Unrealized Loss | 538 | 629
Municipals |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 709 | 483
Less than 12 months Gross Unrealized Loss | 76 | 34
Equal to or Greater than 12 Months Estimated Fair Value | 5,338 | 5,449
Equal to or Greater than 12 Months Gross Unrealized Loss | 1,208 | 1,194
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 452 | 1,034
Less than 12 months Gross Unrealized Loss | 13 | 36
Equal to or Greater than 12 Months Estimated Fair Value | 6,204 | 6,671
Equal to or Greater than 12 Months Gross Unrealized Loss | 741 | 917
Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 30,014 | 24,834
Less than 12 months Gross Unrealized Loss | 1,805 | 1,287
Equal to or Greater than 12 Months Estimated Fair Value | 139,769 | 146,138
Equal to or Greater than 12 Months Gross Unrealized Loss | 25,406 | 23,675
Below Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 1,672 | 1,511
Less than 12 months Gross Unrealized Loss | 94 | 95
Equal to or Greater than 12 Months Estimated Fair Value | 5,589 | 5,951
Equal to or Greater than 12 Months Gross Unrealized Loss | $ 769 | $ 719

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