Other Non-Current Assets - Summary of Other Non-Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other Assets Noncurrent [Abstract]
Deferred financing costs	$ 46	$ 74
Supplier prepayments	26	33
Prepaid incentives	20	20
Pension assets	4	4
Derivative assets		5
Other	14	14
Other non-current assets, Total	$ 110	$ 150