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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Jun. 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 | $ 4,968 | $ 1,550
Gross Unrealized Losses Less than 12 months | (134) | (39)
Fair Value, 12 Months or longer | 223 | 36
Gross Unrealized Losses, 12 months or longer | (16) | 0
Total Fair Value | 5,191 | 1,586
Total Gross Unrealized Losses | $ (150) | $ (39)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 514 | 222
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 41 | 11
Total number of available-for-sale securities in an unrealized loss position | security | 555 | 233
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 1,478 | $ 477
Gross Unrealized Losses Less than 12 months | (15) | (18)
Fair Value, 12 Months or longer | 98 | 0
Gross Unrealized Losses, 12 months or longer | (3) | 0
Total Fair Value | 1,576 | 477
Total Gross Unrealized Losses | (18) | (18)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 112 | 51
Gross Unrealized Losses Less than 12 months | (1) | (3)
Fair Value, 12 Months or longer | 1 | 0
Gross Unrealized Losses, 12 months or longer | (2) | 0
Total Fair Value | 113 | 51
Total Gross Unrealized Losses | (3) | (3)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 3,040 | 865
Gross Unrealized Losses Less than 12 months | (111) | (15)
Fair Value, 12 Months or longer | 48 | 36
Gross Unrealized Losses, 12 months or longer | (8) | 0
Total Fair Value | 3,088 | 901
Total Gross Unrealized Losses | (119) | (15)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 3 | 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 | 3 | 1
Total Gross Unrealized Losses | 0 | 0
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 216 | 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 | 269 | 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 | 10 | 30
Gross Unrealized Losses Less than 12 months | 0 | (1)
Fair Value, 12 Months or longer | 23 | 0
Gross Unrealized Losses, 12 months or longer | (1) | 0
Total Fair Value | 33 | 30
Total Gross Unrealized Losses | (1) | (1)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 95 | 11
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 | 95 | 11
Total Gross Unrealized Losses | 0 | $ 0
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 14 |
Gross Unrealized Losses Less than 12 months | 0 |
Fair Value, 12 Months or longer | 0 |
Gross Unrealized Losses, 12 months or longer | 0 |
Total Fair Value | 14 |
Total Gross Unrealized Losses | $ 0 |

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