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Investments - Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | $ 22,282 | $ 22,067
Allowance for Credit Losses | 0 | (4)
Net Amortized Cost | 22,282 | 22,063
Gross Unrealized Gains | 267 | 57
Gross Unrealized Losses | (836) | (1,840)
Fair Value | 21,713 | 20,280
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,071 | 2,074
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,071 | 2,074
Gross Unrealized Gains | 19 | 0
Gross Unrealized Losses | (54) | (182)
Fair Value | 2,036 | 1,892
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,219 | 2,393
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,219 | 2,393
Gross Unrealized Gains | 31 | 8
Gross Unrealized Losses | (35) | (129)
Fair Value | 2,215 | 2,272
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 10,156 | 9,838
Allowance for Credit Losses | 0 | (3)
Net Amortized Cost | 10,156 | 9,835
Gross Unrealized Gains | 133 | 26
Gross Unrealized Losses | (446) | (903)
Fair Value | 9,843 | 8,958
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,593 | 2,780
Allowance for Credit Losses | 0 | (1)
Net Amortized Cost | 2,593 | 2,779
Gross Unrealized Gains | 41 | 15
Gross Unrealized Losses | (122) | (244)
Fair Value | 2,512 | 2,550
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 862 | 845
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 862 | 845
Gross Unrealized Gains | 8 | 1
Gross Unrealized Losses | (60) | (89)
Fair Value | 810 | 757
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 1,066 | 1,172
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 1,066 | 1,172
Gross Unrealized Gains | 9 | 1
Gross Unrealized Losses | (100) | (155)
Fair Value | 975 | 1,018
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 3,294 | 2,940
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 3,294 | 2,940
Gross Unrealized Gains | 26 | 6
Gross Unrealized Losses | (18) | (136)
Fair Value | 3,302 | 2,810
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 21 | 25
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 21 | 25
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (2)
Fair Value | 20 | 23
Supporting experience- rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 10 | 3
Gross Unrealized Losses | (28) | (59)
Fair Value | $ 592 | $ 609

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