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Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | $ 42,037 | $ 41,102
Gross Unrealized Gains | 698 | 652
Gross Unrealized Losses | 3,787 | 4,056
Allowance for Credit Losses | 22 | 1
Estimated Fair Value | 38,926 | 37,697
Corporate and other bonds |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 24,194 | 23,137
Gross Unrealized Gains | 339 | 301
Gross Unrealized Losses | 1,909 | 2,009
Allowance for Credit Losses | 13 |
Estimated Fair Value | 22,611 | 21,429
States, municipalities and political subdivisions |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 8,262 | 8,918
Gross Unrealized Gains | 341 | 338
Gross Unrealized Losses | 793 | 939
Allowance for Credit Losses |  |
Estimated Fair Value | 7,810 | 8,317
Residential mortgage-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 3,133 | 3,073
Gross Unrealized Gains | 4 | 5
Gross Unrealized Losses | 444 | 447
Allowance for Credit Losses |  |
Estimated Fair Value | 2,693 | 2,631
Commercial mortgage-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 1,843 | 1,886
Gross Unrealized Gains | 4 | 4
Gross Unrealized Losses | 257 | 255
Allowance for Credit Losses | 7 |
Estimated Fair Value | 1,583 | 1,635
Other asset-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 3,571 | 3,287
Gross Unrealized Gains | 9 | 2
Gross Unrealized Losses | 330 | 361
Allowance for Credit Losses | 2 | 1
Estimated Fair Value | 3,248 | 2,927
Asset-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 8,547 | 8,246
Gross Unrealized Gains | 17 | 11
Gross Unrealized Losses | 1,031 | 1,063
Allowance for Credit Losses | 9 | 1
Estimated Fair Value | 7,524 | 7,193
U.S. Treasury and obligations of government-sponsored enterprises |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 130 | 111
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | 3 | 2
Allowance for Credit Losses |  |
Estimated Fair Value | 127 | 110
Foreign government |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 700 | 617
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 50 | 43
Allowance for Credit Losses |  |
Estimated Fair Value | 651 | 575
Redeemable preferred stock |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 5 | 3
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Allowance for Credit Losses |  |
Estimated Fair Value | 5 | 3
Fixed maturities available-for-sale |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 41,838 | 41,032
Gross Unrealized Gains | 698 | 652
Gross Unrealized Losses | 3,786 | 4,056
Allowance for Credit Losses | 22 | 1
Estimated Fair Value | 38,728 | 37,627
Fixed maturities trading |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 199 | 70
Gross Unrealized Gains |  |
Gross Unrealized Losses | 1 |
Allowance for Credit Losses |  |
Estimated Fair Value | $ 198 | $ 70

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