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Investments - Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 23,308 | $ 22,282
Gross Unrealized Gains | 191 | 267
Gross Unrealized Losses | (873) | (836)
Fair Value | 22,626 | 21,713
Allowance for expected credit losses | 0 | 0
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 7 | 10
Gross Unrealized Losses | (32) | (28)
Fair Value | 552 | 592
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,205 | 2,071
Gross Unrealized Gains | 8 | 19
Gross Unrealized Losses | (66) | (54)
Fair Value | 2,147 | 2,036
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,029 | 2,219
Gross Unrealized Gains | 18 | 31
Gross Unrealized Losses | (39) | (35)
Fair Value | 2,008 | 2,215
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,951 | 10,156
Gross Unrealized Gains | 94 | 133
Gross Unrealized Losses | (474) | (446)
Fair Value | 10,571 | 9,843
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,594 | 2,593
Gross Unrealized Gains | 33 | 41
Gross Unrealized Losses | (124) | (122)
Fair Value | 2,503 | 2,512
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 857 | 862
Gross Unrealized Gains | 5 | 8
Gross Unrealized Losses | (62) | (60)
Fair Value | 800 | 810
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,121 | 1,066
Gross Unrealized Gains | 8 | 9
Gross Unrealized Losses | (93) | (100)
Fair Value | 1,036 | 975
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,533 | 3,294
Gross Unrealized Gains | 25 | 26
Gross Unrealized Losses | (15) | (18)
Fair Value | 3,543 | 3,302
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18 | 21
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (1)
Fair Value | $ 18 | $ 20

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