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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, 2019 | Dec. 31, 2018
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Fixed maturities |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (44) | $ (411)
Fair Value - Less than twelve months | $ 4,461 | $ 17,766
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (44) | $ (192)
Fair Value - Twelve months or more | $ 2,224 | $ 3,902
Fair Value as % of Cost - Twelve months or more | 98.00% | 95.00%
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 | $ 16 | $ 41
Fair Value as % of Cost - Less than twelve months | 100.00% | 100.00%
Unrealized Loss - Twelve months or more | $ 0 | $ (3)
Fair Value - Twelve months or more | $ 11 | $ 120
Fair Value as % of Cost - Twelve months or more | 100.00% | 98.00%
States, municipalities and political subdivisions |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (3) | $ (23)
Fair Value - Less than twelve months | $ 254 | $ 1,497
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (32)
Fair Value - Twelve months or more | $ 82 | $ 902
Fair Value as % of Cost - Twelve months or more | 99.00% | 97.00%
Foreign government |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (1) | $ 0
Fair Value - Less than twelve months | $ 70 | $ 18
Fair Value as % of Cost - Less than twelve months | 99.00% | 100.00%
Unrealized Loss - Twelve months or more | $ 0 | $ 0
Fair Value - Twelve months or more | $ 0 | $ 4
Fair Value as % of Cost - Twelve months or more | 0.00% | 100.00%
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 | $ 509 | $ 279
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (5)
Fair Value - Twelve months or more | $ 69 | $ 139
Fair Value as % of Cost - Twelve months or more | 99.00% | 97.00%
Commercial MBS |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 | $ (1)
Fair Value - Less than twelve months | $ 17 | $ 147
Fair Value as % of Cost - Less than twelve months | 100.00% | 99.00%
Unrealized Loss - Twelve months or more | $ 0 | $ (1)
Fair Value - Twelve months or more | $ 0 | $ 30
Fair Value as % of Cost - Twelve months or more | 0.00% | 97.00%
Collateralized loan obligations |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (11) | $ (61)
Fair Value - Less than twelve months | $ 1,284 | $ 3,540
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (26) | $ (12)
Fair Value - Twelve months or more | $ 1,728 | $ 197
Fair Value as % of Cost - Twelve months or more | 99.00% | 94.00%
Other asset-backed securities |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (12) | $ (16)
Fair Value - Less than twelve months | $ 1,211 | $ 1,866
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (8) | $ (11)
Fair Value - Twelve months or more | $ 123 | $ 432
Fair Value as % of Cost - Twelve months or more | 94.00% | 98.00%
Corporate and other |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (13) | $ (306)
Fair Value - Less than twelve months | $ 1,100 | $ 10,378
Fair Value as % of Cost - Less than twelve months | 99.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (8) | $ (128)
Fair Value - Twelve months or more | $ 211 | $ 2,078
Fair Value as % of Cost - Twelve months or more | 96.00% | 94.00%

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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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