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Investments (Details 1) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
U.S. Government and government agencies [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ 0 $ (1)
Fair Value - Less than twelve months $ 12 $ 112
Fair Value as % of Cost - Less than twelve months 100.00% 99.00%
Unrealized Loss - Twelve months or more $ (2) $ (2)
Fair Value - Twelve months or more $ 15 $ 15
Fair Value as % of Cost - Twelve months or more 88.00% 88.00%
States, municipalities and political subdivisions [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (3) $ (33)
Fair Value - Less than twelve months $ 213 $ 1,419
Fair Value as % of Cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more $ (5) $ (2)
Fair Value - Twelve months or more $ 141 $ 50
Fair Value as % of Cost - Twelve months or more 97.00% 96.00%
Residential Mortgage Backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (14) $ (7)
Fair Value - Less than twelve months $ 748 $ 438
Fair Value as % of Cost - Less than twelve months 98.00% 98.00%
Unrealized Loss - Twelve months or more $ (12) $ (8)
Fair Value - Twelve months or more $ 243 $ 201
Fair Value as % of Cost - Twelve months or more 95.00% 96.00%
Commercial Mortgage Backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ 0 $ 0
Fair Value - Less than twelve months $ 50 $ 95
Fair Value as % of Cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ (1) $ (1)
Fair Value - Twelve months or more $ 15 $ 28
Fair Value as % of Cost - Twelve months or more 94.00% 97.00%
Asset-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (60) $ (42)
Fair Value - Less than twelve months $ 2,377 $ 2,706
Fair Value as % of Cost - Less than twelve months 98.00% 98.00%
Unrealized Loss - Twelve months or more $ (11) $ (10)
Fair Value - Twelve months or more $ 449 $ 455
Fair Value as % of Cost - Twelve months or more 98.00% 98.00%
All other corporate [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (130) $ (229)
Fair Value - Less than twelve months $ 2,026 $ 4,661
Fair Value as % of Cost - Less than twelve months 94.00% 95.00%
Unrealized Loss - Twelve months or more $ (42) $ (39)
Fair Value - Twelve months or more $ 324 $ 165
Fair Value as % of Cost - Twelve months or more 89.00% 81.00%
Fixed maturities [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (207) $ (312)
Fair Value - Less than twelve months $ 5,426 $ 9,431
Fair Value as % of Cost - Less than twelve months 96.00% 97.00%
Unrealized Loss - Twelve months or more $ (73) $ (62)
Fair Value - Twelve months or more $ 1,187 $ 914
Fair Value as % of Cost - Twelve months or more 94.00% 94.00%
Common stocks [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (81) $ (79)
Fair Value - Less than twelve months $ 498 $ 509
Fair Value as % of Cost - Less than twelve months 86.00% 87.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 2 $ 0
Fair Value as % of Cost - Twelve months or more 100.00% 0.00%
Perpetual preferred stocks [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (5) $ (3)
Fair Value - Less than twelve months $ 117 $ 91
Fair Value as % of Cost - Less than twelve months 96.00% 97.00%
Unrealized Loss - Twelve months or more $ (4) $ (3)
Fair Value - Twelve months or more $ 22 $ 22
Fair Value as % of Cost - Twelve months or more 85.00% 88.00%
Equity securities [Member]    
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (86) $ (82)
Fair Value - Less than twelve months $ 615 $ 600
Fair Value as % of Cost - Less than twelve months 88.00% 88.00%
Unrealized Loss - Twelve months or more $ (4) $ (3)
Fair Value - Twelve months or more $ 24 $ 22
Fair Value as % of Cost - Twelve months or more 86.00% 88.00%