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Other Current Liabilities - Details of Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued operating expenses	$ 189	$ 211
Accrued exploration and development	1,595	1,792
Accrued compensation and benefits	99	198
Accrued interest	152	160
Accrued income taxes	341	297
Accrued United Kingdom Petroleum Revenue Tax	173	53
Other	174	149
Total Other current liabilities	$ 2,723	$ 2,860

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.

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