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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Acquired Intangible Assets Amortization [Line Items]      
Actual 2015 $ 40 $ 47 $ 44
2016 10    
2017 7    
2018 3    
2019 2    
2020 0    
Internal-use software amortization expense      
Acquired Intangible Assets Amortization [Line Items]      
Actual 2015 6    
2016 6    
2017 4    
2018 3    
2019 0    
2020 0    
External-use software amortization expense      
Acquired Intangible Assets Amortization [Line Items]      
Actual 2015 70    
2016 66    
2017 56    
2018 36    
2019 19    
2020 $ 0