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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 6,781 | $ 1,550
Gross Unrealized Losses Less than 12 months | (161) | (39)
Fair Value, 12 Months or longer | 409 | 36
Gross Unrealized Losses, 12 months or longer | (30) | 0
Total Fair Value | 7,190 | 1,586
Total Gross Unrealized Losses | $ (191) | $ (39)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 916 | 222
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 53 | 11
Total number of available-for-sale securities in an unrealized loss position | security | 969 | 233
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 1,462 | $ 477
Gross Unrealized Losses Less than 12 months | (10) | (18)
Fair Value, 12 Months or longer | 121 | 0
Gross Unrealized Losses, 12 months or longer | (5) | 0
Total Fair Value | 1,583 | 477
Total Gross Unrealized Losses | (15) | (18)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 258 | 51
Gross Unrealized Losses Less than 12 months | (4) | (3)
Fair Value, 12 Months or longer | 3 | 0
Gross Unrealized Losses, 12 months or longer | (2) | 0
Total Fair Value | 261 | 51
Total Gross Unrealized Losses | (6) | (3)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 4,190 | 865
Gross Unrealized Losses Less than 12 months | (130) | (15)
Fair Value, 12 Months or longer | 219 | 36
Gross Unrealized Losses, 12 months or longer | (20) | 0
Total Fair Value | 4,409 | 901
Total Gross Unrealized Losses | (150) | (15)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 2 | 1
Gross Unrealized Losses Less than 12 months | 0 | 0
Fair Value, 12 Months or longer | 0 | 0
Gross Unrealized Losses, 12 months or longer | 0 | 0
Total Fair Value | 2 | 1
Total Gross Unrealized Losses | 0 | 0
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 234 | 115
Gross Unrealized Losses Less than 12 months | (7) | (2)
Fair Value, 12 Months or longer | 53 | 0
Gross Unrealized Losses, 12 months or longer | (2) | 0
Total Fair Value | 287 | 115
Total Gross Unrealized Losses | (9) | (2)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 55 | 30
Gross Unrealized Losses Less than 12 months | (1) | (1)
Fair Value, 12 Months or longer | 11 | 0
Gross Unrealized Losses, 12 months or longer | (1) | 0
Total Fair Value | 66 | 30
Total Gross Unrealized Losses | (2) | (1)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 567 | 11
Gross Unrealized Losses Less than 12 months | (8) | 0
Fair Value, 12 Months or longer | 2 | 0
Gross Unrealized Losses, 12 months or longer | 0 | 0
Total Fair Value | 569 | 11
Total Gross Unrealized Losses | (8) | $ 0
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 13 |
Gross Unrealized Losses Less than 12 months | (1) |
Fair Value, 12 Months or longer | 0 |
Gross Unrealized Losses, 12 months or longer | 0 |
Total Fair Value | 13 |
Total Gross Unrealized Losses | $ (1) |

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