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Investments (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
U.S. Government and government agencies [Member]
   
Available for sale securities in a continuous unrealized loss position    
Fair Value - Less than twelve months $ 11 $ 22
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) (5)
Fair Value - Less than twelve months 368 285
Fair Value as % of Cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more (1) 0
Fair Value - Twelve months or more 49 24
Fair Value as % of Cost - Twelve months or more 98.00% 100.00%
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   0
Fair Value as % of Cost - Less than twelve months   0.00%
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 (3) (3)
Fair Value - Less than twelve months 184 146
Fair Value as % of Cost - Less than twelve months 98.00% 98.00%
Unrealized Loss - Twelve months or more (35) (51)
Fair Value - Twelve months or more 333 411
Fair Value as % of Cost - Twelve months or more 90.00% 89.00%
Commercial Mortgage Backed Securities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months   0
Fair Value - Less than twelve months 7 16
Fair Value as % of Cost - Less than twelve months 100.00% 100.00%
Fair Value - Twelve months or more   0
Fair Value as % of Cost - Twelve months or more   0.00%
Asset-backed Securities [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 299 146
Fair Value as % of Cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more (1) (2)
Fair Value - Twelve months or more 42 57
Fair Value as % of Cost - Twelve months or more 98.00% 97.00%
All other corporate [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 327 237
Fair Value as % of Cost - Less than twelve months 98.00% 99.00%
Unrealized Loss - Twelve months or more (1) (2)
Fair Value - Twelve months or more 43 51
Fair Value as % of Cost - Twelve months or more 98.00% 96.00%
Fixed maturities [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (14) (11)
Fair Value - Less than twelve months 1,196 852
Fair Value as % of Cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more (38) (55)
Fair Value - Twelve months or more 467 543
Fair Value as % of Cost - Twelve months or more 92.00% 91.00%
Common stocks [Member]
   
Available for sale securities in a continuous unrealized loss position    
Unrealized Loss - Less than twelve months (3) (8)
Fair Value - Less than twelve months 61 88
Fair Value as % of Cost - Less than twelve months 95.00% 92.00%
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 0 0
Fair Value - Less than twelve months 17 7
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 $ 26 $ 25
Fair Value as % of Cost - Twelve months or more 96.00% 96.00%