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Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | $ 44,028 | $ 42,615
Gross Unrealized Gains | 1,281 | 1,022
Gross Unrealized Losses | 2,236 | 2,995
Allowance for Credit Losses | 18 | 16
Estimated Fair Value | 43,055 | 40,626
Corporate and other bonds |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 25,872 | 25,020
Gross Unrealized Gains | 826 | 597
Gross Unrealized Losses | 900 | 1,345
Allowance for Credit Losses | 6 | 4
Estimated Fair Value | 25,792 | 24,268
States, municipalities and political subdivisions |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 7,406 | 7,713
Gross Unrealized Gains | 359 | 382
Gross Unrealized Losses | 617 | 703
Allowance for Credit Losses |  |
Estimated Fair Value | 7,148 | 7,392
Residential mortgage-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 3,684 | 3,411
Gross Unrealized Gains | 32 | 16
Gross Unrealized Losses | 362 | 425
Allowance for Credit Losses |  |
Estimated Fair Value | 3,354 | 3,002
Commercial mortgage-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 1,816 | 1,862
Gross Unrealized Gains | 14 | 7
Gross Unrealized Losses | 141 | 230
Allowance for Credit Losses |  | 8
Estimated Fair Value | 1,689 | 1,631
Other asset-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 3,743 | 3,515
Gross Unrealized Gains | 40 | 13
Gross Unrealized Losses | 186 | 256
Allowance for Credit Losses | 12 | 4
Estimated Fair Value | 3,585 | 3,268
Asset-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 9,243 | 8,788
Gross Unrealized Gains | 86 | 36
Gross Unrealized Losses | 689 | 911
Allowance for Credit Losses | 12 | 12
Estimated Fair Value | 8,628 | 7,901
U.S. Treasury and obligations of government-sponsored enterprises |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 224 | 152
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | 4 | 2
Allowance for Credit Losses |  |
Estimated Fair Value | 222 | 151
Foreign government |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 755 | 741
Gross Unrealized Gains | 8 | 6
Gross Unrealized Losses | 26 | 34
Allowance for Credit Losses |  |
Estimated Fair Value | 737 | 713
Fixed maturities available-for-sale |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 43,500 | 42,414
Gross Unrealized Gains | 1,281 | 1,022
Gross Unrealized Losses | 2,236 | 2,995
Allowance for Credit Losses | 18 | 16
Estimated Fair Value | 42,527 | 40,425
Fixed maturities trading |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 528 | 201
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Allowance for Credit Losses |  |
Estimated Fair Value | $ 528 | $ 201

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