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Description of Business, Basis of Presentation and Significant Accounting Policies - Aggregate Amortization Expense for Internal and External-Use Software (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Intangible Assets Amortization [Line Items]      
Actual 2018 $ 7 $ 8 $ 10
2019 5    
2020 4    
2021 4    
2022 2    
Internal-use software amortization expense      
Acquired Intangible Assets Amortization [Line Items]      
Actual 2018 7    
2019 6    
2020 7    
2021 7    
2022 6    
2023 6    
External-use software amortization expense      
Acquired Intangible Assets Amortization [Line Items]      
Actual 2018 48    
2019 34    
2020 23    
2021 0    
2022 0    
2023 $ 0