Income Taxes (Tables)

9 Months Ended

Sep. 30, 2011

Income Taxes [Abstract]

Income Taxes

	Three Months						Nine Months
	Ended September 30,						Ended September 30,
	2011			2010			2011			2010
				(Millions of dollars)
Current	$	169		$	380		$	1,073		$	1,141
Deferred		(252	)		(180	)		(253	)		(242	)
Adjustment to deferred tax liability for foreign income tax rate change (*)		29			—			29			—
Total provision (benefit) for incomes taxes	$	(54	)	$	200		$	849		$	899

(*)  Reflects the July 2011 increase in the supplementary tax on petroleum operations to 32% from 20% in the United Kingdom.