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General (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Premiums and contract charges by product      
Premiums $ 149 $ 150  
Contract charges 182 195  
Total premiums and contract charges 331 345  
Equity securities 14   $ 16
Limited partnership interests 2,405   2,295
Traditional life insurance      
Premiums and contract charges by product      
Premiums 126 129  
Accident and health insurance      
Premiums and contract charges by product      
Premiums 23 21  
Interest-sensitive life insurance      
Premiums and contract charges by product      
Contract charges 179 192  
Fixed annuities      
Premiums and contract charges by product      
Contract charges 3 $ 3  
Accounting Standards Update 2016-01      
Premiums and contract charges by product      
Equity securities 14    
Equity method limited partnerships      
Premiums and contract charges by product      
Limited partnership interests 1,860   $ 1,770
Equity method limited partnerships | Accounting Standards Update 2016-01      
Premiums and contract charges by product      
Limited partnership interests $ 100