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Investment in Unconsolidated Affiliate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]        
Dividends from unconsolidated affiliate   $ 140 $ 0  
StoneRiver Group, L.P.        
Schedule of Equity Method Investments [Line Items]        
Percentage of interest owned in affiliate (as percent)   49.00%    
Deconsolidation gain from equity method investments $ 190      
Dividends from unconsolidated affiliate 140      
Equity method investment, other than temporary impairment 44      
Deconsolidation gain net of impairment from equity method investments 146      
Deconsolidation gain from equity method investments, tax $ 54      
Investments in affiliate   $ 22   $ 17