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Investments (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
U.S. Government and government agencies [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 22 2
Fair Value as % of Cost - Less than twelve months 100.00% 100.00%
States, municipalities and political subdivisions [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (5) (2)
Fair Value - Less than twelve months 285 120
Fair Value as % of Cost - Less than twelve months 98.00% 98.00%
Unrealized Loss - Twelve months or more 0 (1)
Fair Value - Twelve months or more 24 59
Fair Value as % of Cost - Twelve months or more 100.00% 98.00%
Foreign government [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months   0
Fair Value - Less than twelve months   1
Fair Value as % of Cost - Less than twelve months   100.00%
Residential Mortgage Backed Securities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (3) (59)
Fair Value - Less than twelve months 146 1,141
Fair Value as % of Cost - Less than twelve months 98.00% 95.00%
Unrealized Loss - Twelve months or more (51) (121)
Fair Value - Twelve months or more 411 473
Fair Value as % of Cost - Twelve months or more 89.00% 80.00%
Commercial Mortgage Backed Securities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months 0 (6)
Fair Value - Less than twelve months 16 183
Fair Value as % of Cost - Less than twelve months 100.00% 97.00%
Unrealized Loss - Twelve months or more   0
Fair Value - Twelve months or more   18
Fair Value as % of Cost - Twelve months or more   100.00%
All other corporate [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (3) (43)
Fair Value - Less than twelve months 383 940
Fair Value as % of Cost - Less than twelve months 99.00% 96.00%
Unrealized Loss - Twelve months or more (4) (17)
Fair Value - Twelve months or more 108 114
Fair Value as % of Cost - Twelve months or more 96.00% 87.00%
Fixed maturities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (11) (110)
Fair Value - Less than twelve months 852 2,387
Fair Value as % of Cost - Less than twelve months 99.00% 96.00%
Unrealized Loss - Twelve months or more (55) (139)
Fair Value - Twelve months or more 543 664
Fair Value as % of Cost - Twelve months or more 91.00% 83.00%
Common stocks [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (8) (19)
Fair Value - Less than twelve months 88 169
Fair Value as % of Cost - Less than twelve months 92.00% 90.00%
Unrealized Loss - Twelve months or more   (1)
Fair Value - Twelve months or more   4
Fair Value as % of Cost - Twelve months or more   80.00%
Perpetual preferred stocks [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 7 23
Fair Value as % of Cost - Less than twelve months 100.00% 96.00%
Unrealized Loss - Twelve months or more (1) (7)
Fair Value - Twelve months or more $ 25 $ 31
Fair Value as % of Cost - Twelve months or more 96.00% 82.00%