Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
Millions of Dollars

	Year Ended December 31
	2011			2010			2009
Employee Termination Benefits:
Balance at January 1	$	145		$	13		$	44
Additions (deductions) charged (credited) to expense		—			235			(12	)
Payments		(82	)		(103	)		(19	)
Balance at December 31	$	63		$	145		$	13
Allowance for Doubtful Accounts:
Balance at January 1	$	239		$	293		$	275
Additions (reductions) to expense		4			(13	)		92
Bad debt write-offs		(76	)		(41	)		(74	)
Balance at December 31	$	167		$	239		$	293
Deferred Income Tax Valuation Allowance:*
Balance at January 1	$	9,185		$	7,921		$	7,535
Additions to deferred income tax expense		2,216			1,454			2,204
Reduction of deferred income tax expense		(305	)		(190	)		(1,818	)
Balance at December 31	$	11,096		$	9,185		$	7,921

*  See also Note 15 to the Consolidated Financial Statements, beginning on page FS-43.