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Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Details of other current liabilities
Accrued operating expenses	$ 206	$ 221
Accrued exploration and development	1,421	1,430
Accrued compensation and benefits	98	180
Accrued income taxes	474	533
Accrued United Kingdom Petroleum Revenue Tax	171	284
Other	242	276
Total Other current liabilities	$ 2,612	$ 2,924

- Definition

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

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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