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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 | Mar. 31, 2017 | Dec. 31, 2016
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Total fixed maturities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (123) | $ (196)
Fair Value - Less than twelve months | $ 6,719 | $ 8,651
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (42) | $ (49)
Fair Value - Twelve months or more | $ 1,043 | $ 1,160
Fair Value as % of Cost - Twelve months or more | 96.00% | 96.00%
U.S. Government and government agencies |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (1) | $ (1)
Fair Value - Less than twelve months | $ 152 | $ 153
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (2) | $ (2)
Fair Value - Twelve months or more | $ 8 | $ 8
Fair Value as % of Cost - Twelve months or more | 80.00% | 80.00%
States, municipalities and political subdivisions |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (44) | $ (64)
Fair Value - Less than twelve months | $ 1,925 | $ 2,289
Fair Value as % of Cost - Less than twelve months | 98.00% | 97.00%
Unrealized Loss - Twelve months or more | $ (4) | $ (5)
Fair Value - Twelve months or more | $ 37 | $ 44
Fair Value as % of Cost - Twelve months or more | 90.00% | 90.00%
Foreign government |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ 0 |
Fair Value - Less than twelve months | $ 4 |
Fair Value as % of Cost - Less than twelve months | 100.00% |
Unrealized Loss - Twelve months or more | $ 0 |
Fair Value - Twelve months or more | $ 0 |
Fair Value as % of Cost - Twelve months or more | 0.00% |
Residential MBS |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (6) | $ (7)
Fair Value - Less than twelve months | $ 455 | $ 502
Fair Value as % of Cost - Less than twelve months | 99.00% | 99.00%
Unrealized Loss - Twelve months or more | $ (5) | $ (6)
Fair Value - Twelve months or more | $ 188 | $ 162
Fair Value as % of Cost - Twelve months or more | 97.00% | 96.00%
Commercial MBS |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (1) | $ (2)
Fair Value - Less than twelve months | $ 71 | $ 121
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
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%
Asset-backed securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (14) | $ (29)
Fair Value - Less than twelve months | $ 1,313 | $ 1,737
Fair Value as % of Cost - Less than twelve months | 99.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (16) | $ (17)
Fair Value - Twelve months or more | $ 512 | $ 634
Fair Value as % of Cost - Twelve months or more | 97.00% | 97.00%
Corporate and other |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (57) | $ (93)
Fair Value - Less than twelve months | $ 2,799 | $ 3,849
Fair Value as % of Cost - Less than twelve months | 98.00% | 98.00%
Unrealized Loss - Twelve months or more | $ (15) | $ (19)
Fair Value - Twelve months or more | $ 298 | $ 312
Fair Value as % of Cost - Twelve months or more | 95.00% | 94.00%
Total equity securities |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (23) | $ (29)
Fair Value - Less than twelve months | $ 223 | $ 350
Fair Value as % of Cost - Less than twelve months | 91.00% | 92.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (1)
Fair Value - Twelve months or more | $ 6 | $ 6
Fair Value as % of Cost - Twelve months or more | 86.00% | 86.00%
Common stocks |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (21) | $ (23)
Fair Value - Less than twelve months | $ 138 | $ 215
Fair Value as % of Cost - Less than twelve months | 87.00% | 90.00%
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%
Perpetual preferred stocks |  |
Available for sale securities in a continuous unrealized loss position |  |
Unrealized Loss - Less than twelve months | $ (2) | $ (6)
Fair Value - Less than twelve months | $ 85 | $ 135
Fair Value as % of Cost - Less than twelve months | 98.00% | 96.00%
Unrealized Loss - Twelve months or more | $ (1) | $ (1)
Fair Value - Twelve months or more | $ 6 | $ 6
Fair Value as % of Cost - Twelve months or more | 86.00% | 86.00%

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