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Investments (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
U.S. Government and government agencies [Member]
   
Available for sale securities in a continuous unrealized loss position    
Fair Value - Less than twelve months $ 26 $ 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 (1) (2)
Fair Value - Less than twelve months 101 120
Fair Value as % of Cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more (1) (1)
Fair Value - Twelve months or more 16 59
Fair Value as % of Cost - Twelve months or more 94.00% 98.00%
Foreign government [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months     
Fair Value - Less than twelve months    1
Fair Value as % of Cost - Less than twelve months    100.00%
Unrealized Loss - Twelve months or more     
Fair Value - Twelve months or more     
Fair Value as % of Cost - Twelve months or more     
Residential Mortgage Backed Securities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (22) (59)
Fair Value - Less than twelve months 696 1,141
Fair Value as % of Cost - Less than twelve months 97.00% 95.00%
Unrealized Loss - Twelve months or more (104) (121)
Fair Value - Twelve months or more 602 473
Fair Value as % of Cost - Twelve months or more 85.00% 80.00%
Commercial Mortgage Backed Securities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months   (6)
Fair Value - Less than twelve months 39 183
Fair Value as % of Cost - Less than twelve months 99.00% 97.00%
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 (10) (43)
Fair Value - Less than twelve months 408 940
Fair Value as % of Cost - Less than twelve months 98.00% 96.00%
Unrealized Loss - Twelve months or more (13) (17)
Fair Value - Twelve months or more 166 114
Fair Value as % of Cost - Twelve months or more 93.00% 87.00%
Fixed maturities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (33) (110)
Fair Value - Less than twelve months 1,270 2,387
Fair Value as % of Cost - Less than twelve months 97.00% 96.00%
Unrealized Loss - Twelve months or more (118) (139)
Fair Value - Twelve months or more 784 664
Fair Value as % of Cost - Twelve months or more 87.00% 83.00%
Common stocks [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (16) (19)
Fair Value - Less than twelve months 146 169
Fair Value as % of Cost - Less than twelve months 90.00% 90.00%
Unrealized Loss - Twelve months or more (1) (1)
Fair Value - Twelve months or more 4 4
Fair Value as % of Cost - Twelve months or more 80.00% 80.00%
Perpetual preferred stocks [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (1) (1)
Fair Value - Less than twelve months 9 23
Fair Value as % of Cost - Less than twelve months 90.00% 96.00%
Unrealized Loss - Twelve months or more (2) (7)
Fair Value - Twelve months or more $ 22 $ 31
Fair Value as % of Cost - Twelve months or more 92.00% 82.00%