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Other Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Details of Other Current Liabilities    
Accrued operating expenses $ 219 $ 221
Accrued exploration and development 1,681 1,430
Accrued compensation and benefits 130 180
Accrued interest 157 143
Accrued income taxes 472 533
Accrued United Kingdom Petroleum Revenue Tax 180 284
Other 165 133
Total Other current liabilities $ 3,004 $ 2,924