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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | $ 18,152 | $ 26,345
Less than 12 months Gross Unrealized Loss | $ 1,649 | $ 1,382
Total number of securities in an unrealized loss position less than 12 months | 2,855 | 2,922
Equal to or Greater than 12 Months Estimated Fair Value | $ 136,467 | $ 152,089
Equal to or Greater than 12 Months Gross Unrealized Loss | $ 21,852 | $ 24,394
Total number of securities in an unrealized loss position equal or greater than 12 months | 11,063 | 13,049
U.S. corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | $ 4,384 | $ 4,722
Less than 12 months Gross Unrealized Loss | 685 | 420
Equal to or Greater than 12 Months Estimated Fair Value | 41,061 | 45,373
Equal to or Greater than 12 Months Gross Unrealized Loss | 5,258 | 6,208
Foreign corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 2,505 | 3,210
Less than 12 months Gross Unrealized Loss | 181 | 187
Equal to or Greater than 12 Months Estimated Fair Value | 28,069 | 32,355
Equal to or Greater than 12 Months Gross Unrealized Loss | 4,477 | 5,240
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 2,828 | 3,913
Less than 12 months Gross Unrealized Loss | 432 | 246
Equal to or Greater than 12 Months Estimated Fair Value | 19,170 | 19,715
Equal to or Greater than 12 Months Gross Unrealized Loss | 4,735 | 4,187
U.S. government and agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 3,426 | 7,856
Less than 12 months Gross Unrealized Loss | 159 | 368
Equal to or Greater than 12 Months Estimated Fair Value | 15,987 | 13,960
Equal to or Greater than 12 Months Gross Unrealized Loss | 3,481 | 3,344
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 1,926 | 3,465
Less than 12 months Gross Unrealized Loss | 73 | 60
Equal to or Greater than 12 Months Estimated Fair Value | 15,673 | 17,128
Equal to or Greater than 12 Months Gross Unrealized Loss | 2,053 | 2,675
ABS & CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 2,441 | 1,662
Less than 12 months Gross Unrealized Loss | 17 | 31
Equal to or Greater than 12 Months Estimated Fair Value | 5,833 | 11,438
Equal to or Greater than 12 Months Gross Unrealized Loss | 341 | 629
Municipals |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 209 | 483
Less than 12 months Gross Unrealized Loss | 87 | 34
Equal to or Greater than 12 Months Estimated Fair Value | 5,241 | 5,449
Equal to or Greater than 12 Months Gross Unrealized Loss | 990 | 1,194
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 433 | 1,034
Less than 12 months Gross Unrealized Loss | 15 | 36
Equal to or Greater than 12 Months Estimated Fair Value | 5,433 | 6,671
Equal to or Greater than 12 Months Gross Unrealized Loss | 517 | 917
Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 15,804 | 24,834
Less than 12 months Gross Unrealized Loss | 1,577 | 1,287
Equal to or Greater than 12 Months Estimated Fair Value | 131,959 | 146,138
Equal to or Greater than 12 Months Gross Unrealized Loss | 21,256 | 23,675
Below Investment Grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Estimated Fair Value | 2,348 | 1,511
Less than 12 months Gross Unrealized Loss | 72 | 95
Equal to or Greater than 12 Months Estimated Fair Value | 4,508 | 5,951
Equal to or Greater than 12 Months Gross Unrealized Loss | $ 596 | $ 719

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