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Investments - Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | $ 22,067 | $ 22,174
Allowance for Credit Losses | (4) | 0
Net Amortized Cost | 22,063 | 22,174
Gross Unrealized Gains | 57 | 1,172
Gross Unrealized Losses | (1,840) | (106)
Fair Value | 20,280 | 23,240
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,074 | 2,349
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,074 | 2,349
Gross Unrealized Gains | 0 | 70
Gross Unrealized Losses | (182) | (3)
Fair Value | 1,892 | 2,416
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,393 | 2,947
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,393 | 2,947
Gross Unrealized Gains | 8 | 148
Gross Unrealized Losses | (129) | (4)
Fair Value | 2,272 | 3,091
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 9,838 | 9,093
Allowance for Credit Losses | (3) | 0
Net Amortized Cost | 9,835 | 9,093
Gross Unrealized Gains | 26 | 682
Gross Unrealized Losses | (903) | (40)
Fair Value | 8,958 | 9,735
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,780 | 2,821
Allowance for Credit Losses | (1) | 0
Net Amortized Cost | 2,779 | 2,821
Gross Unrealized Gains | 15 | 196
Gross Unrealized Losses | (244) | (24)
Fair Value | 2,550 | 2,993
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 845 | 870
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 845 | 870
Gross Unrealized Gains | 1 | 15
Gross Unrealized Losses | (89) | (10)
Fair Value | 757 | 875
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 1,172 | 1,278
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 1,172 | 1,278
Gross Unrealized Gains | 1 | 44
Gross Unrealized Losses | (155) | (12)
Fair Value | 1,018 | 1,310
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,940 | 2,791
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,940 | 2,791
Gross Unrealized Gains | 6 | 14
Gross Unrealized Losses | (136) | (13)
Fair Value | 2,810 | 2,792
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 25 | 25
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 25 | 25
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (2) | 0
Fair Value | 23 | 28
Supporting experience- rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 3 | 94
Gross Unrealized Losses | (59) | (2)
Fair Value | $ 609 | $ 864

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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