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Investment in Unconsolidated Affiliate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]          
Dividends from unconsolidated affiliate     $ 31 $ 140  
StoneRiver Group, L.P.          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest owned in affiliate     49.00%    
Deconsolidation gain from equity method investments $ 26 $ 190      
Deconsolidation gain from equity method investments, tax 9 54      
Dividends from unconsolidated affiliate $ 31 140      
Equity method investment, other than temporary impairment   44      
Deconsolidation gain net of impairment from equity method investments   $ 146      
Investments in affiliate     $ 9   $ 14