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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 | Jun. 30, 2019 | Dec. 31, 2018
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Total fixed maturities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (34) | $ (411)
Fair Value - Less than twelve months | $ 3,379 | $ 17,766
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (59) | $ (192)
Fair Value - Twelve months or more | $ 2,484 | $ 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 | $ 0 | $ 41
Fair Value as % of Cost - Less than twelve months | 0.00% | 100.00%
Unrealized Loss - Twelve months or more | $ (2) | $ (3)
Fair Value - Twelve months or more | $ 63 | $ 120
Fair Value as % of Cost - Twelve months or more | 97.00% | 98.00%
States, municipalities and political subdivisions |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (1) | $ (23)
Fair Value - Less than twelve months | $ 92 | $ 1,497
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (5) | $ (32)
Fair Value - Twelve months or more | $ 411 | $ 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 | $ 0 | $ 0
Fair Value - Less than twelve months | $ 62 | $ 18
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 | $ 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 | $ (2) | $ (4)
Fair Value - Less than twelve months | $ 107 | $ 279
Fair Value as % of Cost - Less than twelve months | 98.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (2) | $ (5)
Fair Value - Twelve months or more | $ 84 | $ 139
Fair Value as % of Cost - Twelve months or more | 98.00% | 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 | $ 18 | $ 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 | $ (18) | $ (61)
Fair Value - Less than twelve months | $ 1,840 | $ 3,540
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (18) | $ (12)
Fair Value - Twelve months or more | $ 960 | $ 197
Fair Value as % of Cost - Twelve months or more | 98.00% | 94.00%
Other asset-backed securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (4) | $ (16)
Fair Value - Less than twelve months | $ 656 | $ 1,866
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (6) | $ (11)
Fair Value - Twelve months or more | $ 108 | $ 432
Fair Value as % of Cost - Twelve months or more | 95.00% | 98.00%
Corporate and other |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (9) | $ (306)
Fair Value - Less than twelve months | $ 604 | $ 10,378
Fair Value as % of Cost - Less than twelve months | 99.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (26) | $ (128)
Fair Value - Twelve months or more | $ 858 | $ 2,078
Fair Value as % of Cost - Twelve months or more | 97.00% | 94.00%

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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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