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v3.25.3

Investments - Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 27,705 | $ 26,562
Gross Unrealized Gains | 462 | 178
Gross Unrealized Losses | (332) | (707)
Fair Value | 27,835 | 26,033
Allowance for expected credit losses | 0 | 0
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 11 | 5
Gross Unrealized Losses | (15) | (30)
Fair Value | 487 | 543
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,850 | 2,826
Gross Unrealized Gains | 42 | 7
Gross Unrealized Losses | (7) | (38)
Fair Value | 2,885 | 2,795
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 293 | 712
Gross Unrealized Gains | 2 | 4
Gross Unrealized Losses | (8) | (18)
Fair Value | 287 | 698
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,768 | 13,043
Gross Unrealized Gains | 266 | 94
Gross Unrealized Losses | (214) | (412)
Fair Value | 13,820 | 12,725
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,798 | 2,608
Gross Unrealized Gains | 76 | 27
Gross Unrealized Losses | (36) | (111)
Fair Value | 2,838 | 2,524
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 963 | 792
Gross Unrealized Gains | 12 | 2
Gross Unrealized Losses | (34) | (54)
Fair Value | 941 | 740
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,935 | 1,731
Gross Unrealized Gains | 32 | 9
Gross Unrealized Losses | (32) | (67)
Fair Value | 1,935 | 1,673
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,083 | 4,834
Gross Unrealized Gains | 32 | 35
Gross Unrealized Losses | (1) | (7)
Fair Value | 5,114 | 4,862
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15 | 16
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 15 | $ 16

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