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Sale of Business (Details Textual)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 24, 2015
USD ($)
Mar. 31, 2015
Apr. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
policy
Mar. 31, 2015
USD ($)
Nov. 30, 2015
Sale of Business            
Realized gains (losses) on subsidiaries       $ 0 $ (162)  
Run-off long-term care insurance business [Member]            
Sale of Business            
Cash proceeds from the sale of business $ 7          
Investment securities proceeds received from the sale of business 11          
Potential additional sale proceeds based on the release of certain statutory liabilities of the legal entities sold       13    
Long-term care insurance reserves of business sold as a percentage of total long-term care insurance reserves           96.00%
Cash and investment securities proceeds from the sale of business 18          
Total expected tax benefits proceeds from the sale of business       97    
Loss on subsidiaries, pretax (166)       (162)  
Loss on subsidiaries, net of tax $ (108)       $ (105)  
Carrying value of the assets and liabilities of business sold as a percentage of total assets and liabilities 4.00% 4.00%        
Run-off long-term care insurance business [Member] | Reduced estimated tax payments [Member]            
Sale of Business            
Tax benefits proceeds from the sale of business       $ 66    
Run-off long-term care insurance business [Member] | Carryback of the tax-basis capital loss [Member] | Subsequent event [Member]            
Sale of Business            
Tax benefits proceeds from the sale of business     $ 30      
AFG [Member] | Run-off long-term care insurance business [Member]            
Sale of Business            
Number of long-term care insurance policies | policy       1,700    
Long-term care insurance reserves       $ 35