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Investments - Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | $ 22,117 | $ 22,067
Allowance for Credit Losses | (3) | (4)
Net Amortized Cost | 22,114 | 22,063
Gross Unrealized Gains | 101 | 57
Gross Unrealized Losses | (1,393) | (1,840)
Fair Value | 20,822 | 20,280
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 5 | 3
Gross Unrealized Losses | (40) | (59)
Fair Value | 620 | 609
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 | 4 | 0
Gross Unrealized Losses | (140) | (182)
Fair Value | 1,935 | 1,892
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,322 | 2,393
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,322 | 2,393
Gross Unrealized Gains | 18 | 8
Gross Unrealized Losses | (86) | (129)
Fair Value | 2,254 | 2,272
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 9,983 | 9,838
Allowance for Credit Losses | (2) | (3)
Net Amortized Cost | 9,981 | 9,835
Gross Unrealized Gains | 48 | 26
Gross Unrealized Losses | (665) | (903)
Fair Value | 9,364 | 8,958
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,765 | 2,780
Allowance for Credit Losses | (1) | (1)
Net Amortized Cost | 2,764 | 2,779
Gross Unrealized Gains | 21 | 15
Gross Unrealized Losses | (193) | (244)
Fair Value | 2,592 | 2,550
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 881 | 845
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 881 | 845
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (71) | (89)
Fair Value | 812 | 757
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 1,173 | 1,172
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 1,173 | 1,172
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (146) | (155)
Fair Value | 1,028 | 1,018
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,901 | 2,940
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,901 | 2,940
Gross Unrealized Gains | 7 | 6
Gross Unrealized Losses | (90) | (136)
Fair Value | 2,818 | 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 | (2) | (2)
Fair Value | $ 19 | $ 23

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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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