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Investments - Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 26,345 | $ 26,562
Gross Unrealized Gains | 246 | 178
Gross Unrealized Losses | (547) | (707)
Fair Value | 26,044 | 26,033
Allowance for expected credit losses | 0 | 0
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 6 | 5
Gross Unrealized Losses | (22) | (30)
Fair Value | 517 | 543
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,869 | 2,826
Gross Unrealized Gains | 30 | 7
Gross Unrealized Losses | (19) | (38)
Fair Value | 2,880 | 2,795
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 387 | 712
Gross Unrealized Gains | 2 | 4
Gross Unrealized Losses | (13) | (18)
Fair Value | 376 | 698
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,326 | 13,043
Gross Unrealized Gains | 135 | 94
Gross Unrealized Losses | (334) | (412)
Fair Value | 13,127 | 12,725
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,603 | 2,608
Gross Unrealized Gains | 34 | 27
Gross Unrealized Losses | (81) | (111)
Fair Value | 2,556 | 2,524
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 828 | 792
Gross Unrealized Gains | 7 | 2
Gross Unrealized Losses | (41) | (54)
Fair Value | 794 | 740
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,775 | 1,731
Gross Unrealized Gains | 16 | 9
Gross Unrealized Losses | (50) | (67)
Fair Value | 1,741 | 1,673
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,542 | 4,834
Gross Unrealized Gains | 22 | 35
Gross Unrealized Losses | (9) | (7)
Fair Value | 4,555 | 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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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