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Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Amortization expense for acquired intangible assets $ 163 $ 159 $ 158
Product development expenditures as percentage of total revenue 8.00% 8.00% 8.00%
Amortization expense for intangible assets $ 4    
Customer related intangible assets | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 10 years    
Customer related intangible assets | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 20 years    
Acquired software and technology | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 4 years    
Acquired software and technology | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 8 years    
Trade names | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 8 years    
Trade names | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 20 years    
Capitalized software development costs      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 5 years    
Gross software development costs $ 193 $ 159 $ 143
Amortization of previously capitalized software development costs 137 123 106
Purchased software      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense for intangible assets $ 47 $ 44 $ 40
Purchased software | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 3 years    
Purchased software | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Useful lives 5 years    
Acquired intangible assets      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2019 $ 180    
2020 160    
2021 150    
2022 150    
2023 140    
Capitalized and purchased software      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2019 $ 210