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Related Party Transactions - Narrative (Details) - Blackstone - USD ($)
shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 15, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]          
Stock sold (in shares)   24,750      
Percentage of outstanding shares sold   25.00%      
Percentage of outstanding shares before transaction   40.00%      
Percentage of outstanding shares after transaction 15.00%        
Commissions and other fees earned     $ 51 $ 44  
Due from related parties $ 19   $ 19   $ 20