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Other Current Liabilities - Details of Other Current Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Accrued Liabilities [Line Items]    
Accrued operating expenses $ 211 $ 221
Accrued exploration and development 1,792 1,430
Accrued compensation and benefits 198 180
Accrued interest 160 135
Accrued income taxes 297 533
Accrued U.K. Petroleum Revenue Tax 53 284
Other 149 141
Total Other current liabilities $ 2,860 $ 2,924