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Investments - Gross unrealized losses on securities by investment category and length of time that have been in a continuous unrealized loss position (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Fixed maturities |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (77) | $ (44)
Fair Value - Less than twelve months | $ 3,367 | $ 4,461
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (41) | $ (44)
Fair Value - Twelve months or more | $ 2,161 | $ 2,224
Fair Value as % of Cost - Twelve months or more | 98.00% | 98.00%
U.S. Government and government agencies |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ 0
Fair Value - Less than twelve months | $ 23 | $ 16
Fair Value as % of Cost - Less than twelve months | 100.00% | 100.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 0 | $ 11
Fair Value as % of Cost - Twelve months or more | 0.00% | 100.00%
States, municipalities and political subdivisions |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (2) | $ (3)
Fair Value - Less than twelve months | $ 117 | $ 254
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ 0 | $ (1)
Fair Value - Twelve months or more | $ 11 | $ 82
Fair Value as % of Cost - Twelve months or more | 100.00% | 99.00%
Foreign government |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ (1)
Fair Value - Less than twelve months | $ 7 | $ 70
Fair Value as % of Cost - Less than twelve months | 100.00% | 99.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 0 | $ 0
Fair Value as % of Cost - Twelve months or more | 0.00% | 0.00%
Residential MBS |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (4) | $ (4)
Fair Value - Less than twelve months | $ 210 | $ 509
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (1)
Fair Value - Twelve months or more | $ 30 | $ 69
Fair Value as % of Cost - Twelve months or more | 97.00% | 99.00%
Commercial MBS |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (1) | $ 0
Fair Value - Less than twelve months | $ 39 | $ 17
Fair Value as % of Cost - Less than twelve months | 98.00% | 100.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 9 | $ 0
Fair Value as % of Cost - Twelve months or more | 100.00% | 0.00%
Collateralized loan obligations |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (3) | $ (11)
Fair Value - Less than twelve months | $ 673 | $ 1,284
Fair Value as % of Cost - Less than twelve months | 100.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (14) | $ (26)
Fair Value - Twelve months or more | $ 1,599 | $ 1,728
Fair Value as % of Cost - Twelve months or more | 99.00% | 99.00%
Other asset-backed securities |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (45) | $ (12)
Fair Value - Less than twelve months | $ 1,440 | $ 1,211
Fair Value as % of Cost - Less than twelve months | 97.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (21) | $ (8)
Fair Value - Twelve months or more | $ 388 | $ 123
Fair Value as % of Cost - Twelve months or more | 95.00% | 94.00%
Corporate and other |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (22) | $ (13)
Fair Value - Less than twelve months | $ 858 | $ 1,100
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (5) | $ (8)
Fair Value - Twelve months or more | $ 124 | $ 211
Fair Value as % of Cost - Twelve months or more | 96.00% | 96.00%

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- Definition Available for sale securities continuous unrealized loss position less than twelve months fair value as percentage of cost. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position twelve months or longer fair value as percentage of cost. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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