Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 25 $ 21  
Customer invoices due 30 days    
Maximum invested cash maturity period 18 months    
Maximum security maturity period 3 years    
Total property and equipment $ 254 234  
Foreign currency exchange gain (loss) (3) (6) $ 1
Buildings      
Total property and equipment   123  
Finance lease right-of-use assets      
Total property and equipment 114    
Leasehold improvements      
Total property and equipment 49 41  
Computer equipment and purchased software      
Total property and equipment 70 52  
Furniture, office equipment and other      
Total property and equipment $ 21 $ 18  
Computer Equipment, Furniture, Office Equipment and Other | Minimum      
Property estimated useful life 3 years    
Computer Equipment, Furniture, Office Equipment and Other | Maximum      
Property estimated useful life 5 years