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Investments - Debt Securities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 20,938 | $ 19,396
Gross Unrealized Gains | 1,440 | 1,803
Gross Unrealized Losses | (32) | (11)
Fair Value | 22,346 | 21,188
Allowance for credit losses recorded | 0 | 0
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 110 | 135
Gross Unrealized Losses | (1) | 0
Fair Value | 886 | 919
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,320 | 2,341
Gross Unrealized Gains | 91 | 128
Gross Unrealized Losses | (1) | 0
Fair Value | 2,410 | 2,469
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,978 | 2,556
Gross Unrealized Gains | 168 | 172
Gross Unrealized Losses | (2) | 0
Fair Value | 3,144 | 2,728
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,754 | 7,879
Gross Unrealized Gains | 822 | 1,023
Gross Unrealized Losses | (14) | (8)
Fair Value | 9,562 | 8,894
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,652 | 2,595
Gross Unrealized Gains | 247 | 324
Gross Unrealized Losses | (6) | (1)
Fair Value | 2,893 | 2,918
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 812 | 673
Gross Unrealized Gains | 20 | 32
Gross Unrealized Losses | (3) | 0
Fair Value | 829 | 705
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,023 | 962
Gross Unrealized Gains | 63 | 84
Gross Unrealized Losses | (5) | 0
Fair Value | 1,081 | 1,046
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,372 | 2,369
Gross Unrealized Gains | 26 | 36
Gross Unrealized Losses | (1) | (2)
Fair Value | 2,397 | 2,403
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 27 | 21
Gross Unrealized Gains | 3 | 4
Gross Unrealized Losses | 0 | 0
Fair Value | $ 30 | $ 25

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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