Other Current Assets - Summary of Other Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Prepaid Expense And Other Assets Current [Abstract]
Restricted cash	$ 63	$ 44
Sales and use tax receivables	29	30
Prepaid incentives	22	20
Prepaid expenses	20	22
Derivative assets	3	3
Other	9	15
Other current assets, Total	$ 146	$ 134