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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fixed Maturity Securities [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | $ 10,066 | $ 2,148
12 months or longer | 87 | 272
Total | 10,153 | 2,420
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 1,099 | 31
12 months or longer | 18 | 14
Total | 1,117 | 45
Corporate and Other Bonds [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 7,036 | 914
12 months or longer | 44 | 186
Total | 7,080 | 1,100
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 804 | 21
12 months or longer | 13 | 11
Total | 817 | 32
States, Municipalities and Political Subdivisions [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 82 | 34
Total | 82 | 34
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2 |
Total | 2 |
Total Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 2,861 | 1,079
12 months or longer | 43 | 83
Total | 2,904 | 1,162
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 289 | 7
12 months or longer | 5 | 3
Total | 294 | 10
Residential Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 166 | 249
12 months or longer | 22 | 30
Total | 188 | 279
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 7 | 1
12 months or longer | 1 |
Total | 8 | 1
Commercial Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,185 | 381
12 months or longer | 12 | 20
Total | 1,197 | 401
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 151 | 3
12 months or longer | 2 | 2
Total | 153 | 5
Other Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,510 | 449
12 months or longer | 9 | 33
Total | 1,519 | 482
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 131 | 3
12 months or longer | 2 | 1
Total | 133 | 4
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 2 | 62
12 months or longer |  | 2
Total | 2 | 64
Gross Unrealized Losses [Abstract] |  |
Less than 12 months |  | 2
Total |  | 2
Foreign Government [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 76 | 59
12 months or longer |  | 1
Total | 76 | 60
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 4 | 1
Total | 4 | $ 1
Redeemable Preferred Stock [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 9 |
Total | $ 9 |

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