Other Non-Current Assets - Summary of Other Non-Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other Assets Noncurrent [Abstract]
Deferred debt finance costs	$ 43	$ 74
Supplier prepayments	26	33
Prepaid incentives	21	20
Pension assets	5	4
Derivative assets	10	5
Other	15	14
Other non-current assets, Total	$ 120	$ 150