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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | $ 26,345 | $ 165,460
Less than 12 months, Gross Unrealized Loss | $ 1,382 | $ 23,406
Total number of securities in an unrealized loss position less than 12 months | 2,922 | 15,204
Equal to or Greater than 12 Months, Estimated Fair Value | $ 152,089 | $ 41,420
Equal to or Greater than 12 Months ,Gross Unrealized Loss | $ 24,394 | $ 10,889
Total number of securities in an unrealized loss position equal or greater than 12 months | 13,049 | 4,303
U.S. corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | $ 4,722 | $ 55,210
Less than 12 months, Gross Unrealized Loss | 420 | 7,573
Equal to or Greater than 12 Months, Estimated Fair Value | 45,373 | 6,484
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 6,208 | 1,965
Foreign corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 3,210 | 31,932
Less than 12 months, Gross Unrealized Loss | 187 | 5,999
Equal to or Greater than 12 Months, Estimated Fair Value | 32,355 | 8,956
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 5,240 | 2,332
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 3,913 | 16,568
Less than 12 months, Gross Unrealized Loss | 246 | 2,170
Equal to or Greater than 12 Months, Estimated Fair Value | 19,715 | 8,308
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 4,187 | 2,874
U.S. government and agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 7,856 | 20,436
Less than 12 months, Gross Unrealized Loss | 368 | 2,784
Equal to or Greater than 12 Months, Estimated Fair Value | 13,960 | 4,177
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 3,344 | 1,076
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 3,465 | 16,223
Less than 12 months, Gross Unrealized Loss | 60 | 1,890
Equal to or Greater than 12 Months, Estimated Fair Value | 17,128 | 6,650
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 2,675 | 1,628
ABS & CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 1,662 | 10,924
Less than 12 months, Gross Unrealized Loss | 31 | 712
Equal to or Greater than 12 Months, Estimated Fair Value | 11,438 | 4,326
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 629 | 480
Municipals |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 483 | 7,277
Less than 12 months, Gross Unrealized Loss | 34 | 1,514
Equal to or Greater than 12 Months, Estimated Fair Value | 5,449 | 482
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 1,194 | 199
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 1,034 | 6,890
Less than 12 months, Gross Unrealized Loss | 36 | 764
Equal to or Greater than 12 Months, Estimated Fair Value | 6,671 | 2,037
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 917 | 335
Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 24,834 | 157,654
Less than 12 months, Gross Unrealized Loss | 1,287 | 22,713
Equal to or Greater than 12 Months, Estimated Fair Value | 146,138 | 38,785
Equal to or Greater than 12 Months ,Gross Unrealized Loss | 23,675 | 10,298
Below Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 1,511 | 7,806
Less than 12 months, Gross Unrealized Loss | 95 | 693
Equal to or Greater than 12 Months, Estimated Fair Value | 5,951 | 2,635
Equal to or Greater than 12 Months ,Gross Unrealized Loss | $ 719 | $ 591

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