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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
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%