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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]        
Management fee paid     $ 21  
Affiliated Entity | Management Services Agreement        
Related Party Transaction [Line Items]        
Management fee paid     $ 2 $ 7
IPO        
Related Party Transaction [Line Items]        
Management fee paid   $ 21    
IPO | TPG and Silver Lake | Management Services Agreement        
Related Party Transaction [Line Items]        
Management fee paid $ 21      
Minimum        
Related Party Transaction [Line Items]        
Management fee paid   5    
Minimum | Management Services Agreement        
Related Party Transaction [Line Items]        
Management fee paid   5    
Maximum        
Related Party Transaction [Line Items]        
Management fee paid   7    
Maximum | Management Services Agreement        
Related Party Transaction [Line Items]        
Management fee paid   $ 7