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Investments (Details 1) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
U.S. Government and government agencies [Member]    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (1) $ 0
Fair Value - Less than twelve months $ 112 $ 39
Fair Value as % of Cost - Less than twelve months 99.00% 100.00%
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 $ (33) $ (2)
Fair Value - Less than twelve months $ 1,419 $ 222
Fair Value as % of Cost - Less than twelve months 98.00% 99.00%
Unrealized Loss - Twelve months or more $ (2) $ (8)
Fair Value - Twelve months or more $ 50 $ 408
Fair Value as % of Cost - Twelve months or more 96.00% 98.00%
Residential Mortgage Backed Securities [Member]    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (7) $ (4)
Fair Value - Less than twelve months $ 438 $ 298
Fair Value as % of Cost - Less than twelve months 98.00% 99.00%
Unrealized Loss - Twelve months or more $ (8) $ (11)
Fair Value - Twelve months or more $ 201 $ 209
Fair Value as % of Cost - Twelve months or more 96.00% 95.00%
Commercial Mortgage Backed Securities [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 $ 95 $ 38
Fair Value as % of Cost - Less than twelve months 100.00% 97.00%
Unrealized Loss - Twelve months or more $ (1) $ 0
Fair Value - Twelve months or more $ 28 $ 11
Fair Value as % of Cost - Twelve months or more 97.00% 100.00%
Asset-backed Securities [Member]    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (42) $ (11)
Fair Value - Less than twelve months $ 2,706 $ 1,389
Fair Value as % of Cost - Less than twelve months 98.00% 99.00%
Unrealized Loss - Twelve months or more $ (10) $ (11)
Fair Value - Twelve months or more $ 455 $ 622
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 $ (229) $ (16)
Fair Value - Less than twelve months $ 4,661 $ 588
Fair Value as % of Cost - Less than twelve months 95.00% 97.00%
Unrealized Loss - Twelve months or more $ (39) $ (13)
Fair Value - Twelve months or more $ 165 $ 433
Fair Value as % of Cost - Twelve months or more 81.00% 97.00%
Fixed maturities [Member]    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (312) $ (34)
Fair Value - Less than twelve months $ 9,431 $ 2,574
Fair Value as % of Cost - Less than twelve months 97.00% 99.00%
Unrealized Loss - Twelve months or more $ (62) $ (45)
Fair Value - Twelve months or more $ 914 $ 1,698
Fair Value as % of Cost - Twelve months or more 94.00% 97.00%
Common stocks [Member]    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (79) $ (25)
Fair Value - Less than twelve months $ 509 $ 260
Fair Value as % of Cost - Less than twelve months 87.00% 91.00%
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 [Member]    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months $ (3) $ (1)
Fair Value - Less than twelve months $ 91 $ 45
Fair Value as % of Cost - Less than twelve months 97.00% 98.00%
Unrealized Loss - Twelve months or more $ (3) $ (4)
Fair Value - Twelve months or more $ 22 $ 55
Fair Value as % of Cost - Twelve months or more 88.00% 93.00%