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Other Current Liabilities - Details of Other Current Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Accrued operating expenses $ 224 $ 211
Accrued exploration and development 1,573 1,792
Accrued compensation and benefits 136 198
Accrued interest 187 160
Accrued income taxes 370 297
Accrued United Kingdom Petroleum Revenue Tax 196 53
Other 151 149
Total Other current liabilities $ 2,837 $ 2,860