Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other current liabilities
Accrued payroll and employee benefits	$ 340	$ 270
Distribution payable	278
Deferred revenue	181	134
Deferred revenue of consolidated variable interest entities	16	16
Accrued taxes, other than income	127	126
Accrued interest	132	97
Unearned income	2	15
Contingent liabilities	1,229	164
Other	45	61
Total other current liabilities	2,350	883
Other long-term liabilities
Long-term income taxes payable	729	675
Accrued pension liabilities	579	426
Deferred revenue	244	302
Deferred revenue of consolidated variable interest entities	85	91
Drilling contract intangibles	103	152
Accrued retiree life insurance and medical benefits	49	52
Other	114	93
Total other long-term liabilities	$ 1,903	$ 1,791