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Investments (Details 12) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost $ 445  
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost 285  
Limited partnership interests 5,091 $ 4,874
Fixed income and equity securities    
Other details of unrealized loss    
Unrealized losses 730 1,099
Investment grade fixed income securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost 156  
Unrealized losses 224 467
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost 68  
Below investment grade fixed income securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost 178  
Unrealized losses 356 493
Unrealized losses having loss of less than twenty percent, less than 12 months 132  
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost 178  
Unrealized losses related to securities with unrealized loss position greater than 20% of cost or amortized cost, unrealized loss position of 12 or more consecutive months 18  
Below Investment Grade Equity Securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost 39  
Equity securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost 111  
Unrealized losses 150 139
Equity-method limited partnerships    
Other details of unrealized loss    
Limited partnership interests 3,900 3,720
Carrying value    
Other details of unrealized loss    
Cost method limited partnerships 1,193 1,154
Carrying value | Cost-method Investments    
Other details of unrealized loss    
Cost method limited partnerships $ 1,190 $ 1,150