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Estimated Future Amortization Expense Related to Capitalized Software (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Line Items]  
2017 $ 7
2018 5
2019 4
2020 4
2021 4
Capitalized Software  
Finite Lived Intangible Assets Future Amortization Expense [Line Items]  
2017 35
2018 25
2019 15
2020 9
2021 $ 5