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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalents $ 403,000,000 $ 301,000,000  
Restricted cash 15,000,000 56,000,000  
Reserves netted against receivables 13,000,000 14,000,000 $ 16,000,000
Goodwill, impairment loss $ 0 0 0
Cost method investment, ownership percentage 20.00%    
Initial Listing      
Summary Of Significant Accounting Policies [Line Items]      
Listings estimated useful life 6 years    
Additional Shares Listing      
Summary Of Significant Accounting Policies [Line Items]      
Listings estimated useful life 4 years    
Other      
Summary Of Significant Accounting Policies [Line Items]      
Asset impairment charge $ 0 0 $ 0
Cash Equivalents      
Summary Of Significant Accounting Policies [Line Items]      
Maturities 90 days    
Cash and cash equivalents $ 251,000,000 157,000,000  
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Revenue recognition period 1 year    
Minimum | Computer Software      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life 3 years    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Revenue recognition period 2 years    
Maximum | Computer Software      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life 5 years    
Buildings and improvements | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful life 10 years    
Buildings and improvements | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful life 40 years    
Data processing equipment and software | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful life 2 years    
Data processing equipment and software | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful life 5 years    
Furniture and Equipment | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful life 5 years    
Furniture and Equipment | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful life 10 years    
Rebranding of Trade Name      
Summary Of Significant Accounting Policies [Line Items]      
Asset impairment charge $ 578,000,000 119,000,000  
Accounting Standards Update 2015-17 | New Accounting Pronouncement, Early Adoption, Effect      
Summary Of Significant Accounting Policies [Line Items]      
Current deferred tax assets   (24,000,000)  
Current deferred tax liabilities   (24,000,000)  
Noncurrent deferred tax assets   24,000,000  
Noncurrent deferred tax liabilities   24,000,000  
Not Designated as Hedging Instrument | Foreign exchange forward      
Summary Of Significant Accounting Policies [Line Items]      
Fair value of derivative instruments $ 0 $ 0  
Corporate Services      
Summary Of Significant Accounting Policies [Line Items]      
Number of types of license agreements | agreement 2    
Employee Stock Purchase Plan      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of fair market value of common stock 85.00%    
Discount given to employees 15.00%