Other Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other current assets:
Refinery metal inventory and receivable	$ 636	$ 796
Prepaid assets	224	93
Derivative instruments	120	127
Restricted cash	0	20
Note receivable	0	12
Other	109	85
Other current assets, total	1,089	1,133
Other long-term assets:
Goodwill	188	188
Derivative instruments	142	112
Intangible assets	139	147
Restricted cash	98	48
Debt issuance costs	76	59
Income tax receivable	57	142
Other receivables	11	17
Other	185	144
Other long-term assets, total	$ 896	$ 857