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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquired Intangible Assets Amortization [Line Items]      
Actual 2016 $ 10 $ 40 $ 47
2017 7    
2018 3    
2019 1    
2020 0    
Internal-use software amortization expense      
Acquired Intangible Assets Amortization [Line Items]      
Actual 2016 6    
2017 6    
2018 4    
2019 3    
2020 0    
2021 0    
External-use software amortization expense      
Acquired Intangible Assets Amortization [Line Items]      
Actual 2016 62    
2017 68    
2018 49    
2019 34    
2020 23    
2021 $ 0