Other Non-Current Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other non-current assets consisted of:
Development advances	$ 87	$ 100
Deferred financing costs	74	98	37	42
Supplier prepayments	33	14
Derivative assets	5
Pension assets	4	7
Other	15	18
Other non-current assets, Total	$ 218	$ 237