Other Non-Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of other non-current liabilities
Pension and post-retirement benefit liabilities	$ 176	$ 188
Income tax payable	23	26
Derivative liabilities		2
Other	75	63
Other non-current liabilities	$ 274	$ 279