v3.7.0.1
Significant Accounting Policies Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Recorded expense associated with doubtful accounts $ 31 $ 32 $ 26
Net aggregate financing receivables $ 214 $ 188  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 0.50%