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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, 2016
Dec. 31, 2015
Fixed maturities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (196) $ (312)
Fair Value - Less than twelve months $ 8,651 $ 9,431
Fair Value as % of Cost - Less than twelve months 98.00% 97.00%
Unrealized Loss - Twelve months or more $ (49) $ (62)
Fair Value - Twelve months or more $ 1,160 $ 914
Fair Value as % of Cost - Twelve months or more 96.00% 94.00%
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 $ 153 $ 112
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 $ 15
Fair Value as % of Cost - Twelve months or more 80.00% 88.00%
States, municipalities and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (64) $ (33)
Fair Value - Less than twelve months $ 2,289 $ 1,419
Fair Value as % of Cost - Less than twelve months 97.00% 98.00%
Unrealized Loss - Twelve months or more $ (5) $ (2)
Fair Value - Twelve months or more $ 44 $ 50
Fair Value as % of Cost - Twelve months or more 90.00% 96.00%
Residential MBS    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (7) $ (7)
Fair Value - Less than twelve months $ 502 $ 438
Fair Value as % of Cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more $ (6) $ (8)
Fair Value - Twelve months or more $ 162 $ 201
Fair Value as % of Cost - Twelve months or more 96.00% 96.00%
Commercial MBS    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (2) $ 0
Fair Value - Less than twelve months $ 121 $ 95
Fair Value as % of Cost - Less than twelve months 98.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ (1)
Fair Value - Twelve months or more $ 0 $ 28
Fair Value as % of Cost - Twelve months or more 0.00% 97.00%
Asset-backed securities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (29) $ (42)
Fair Value - Less than twelve months $ 1,737 $ 2,706
Fair Value as % of Cost - Less than twelve months 98.00% 98.00%
Unrealized Loss - Twelve months or more $ (17) $ (10)
Fair Value - Twelve months or more $ 634 $ 455
Fair Value as % of Cost - Twelve months or more 97.00% 98.00%
Corporate and other    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (93) $ (229)
Fair Value - Less than twelve months $ 3,849 $ 4,661
Fair Value as % of Cost - Less than twelve months 98.00% 95.00%
Unrealized Loss - Twelve months or more $ (19) $ (39)
Fair Value - Twelve months or more $ 312 $ 165
Fair Value as % of Cost - Twelve months or more 94.00% 81.00%
Equity securities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (29) $ (82)
Fair Value - Less than twelve months $ 350 $ 600
Fair Value as % of Cost - Less than twelve months 92.00% 88.00%
Unrealized Loss - Twelve months or more $ (1) $ (3)
Fair Value - Twelve months or more $ 6 $ 22
Fair Value as % of Cost - Twelve months or more 86.00% 88.00%
Common stocks    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (23) $ (79)
Fair Value - Less than twelve months $ 215 $ 509
Fair Value as % of Cost - Less than twelve months 90.00% 87.00%
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 $ (6) $ (3)
Fair Value - Less than twelve months $ 135 $ 91
Fair Value as % of Cost - Less than twelve months 96.00% 97.00%
Unrealized Loss - Twelve months or more $ (1) $ (3)
Fair Value - Twelve months or more $ 6 $ 22
Fair Value as % of Cost - Twelve months or more 86.00% 88.00%