Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The fair value hierarchy for assets and liabilities measured at fair value on a recurring basis at March 31, 2013 and December 31, 2012 is as follows:

Assets and Liabilities Measured at Fair Value on a Recurring Basis

(Millions of dollars)

	At March 31, 2013								At December 31, 2012
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Marketable Securities	$	266	$	266	$	—	$	—	$	266	$	266	$	—	$	—
Derivatives	64		2		62		—		86		21		65		—
Total Assets at Fair Value	$	330	$	268	$	62	$	—	$	352	$	287	$	65	$	—
Derivatives	110		106		4		—		149		148		1		—
Total Liabilities at Fair Value	$	110	$	106	$	4	$	—	$	149	$	148	$	1	$	—

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The fair value hierarchy for assets and liabilities measured at fair value on a nonrecurring basis at March 31, 2013 is as follows:

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

(Millions of dollars)

	At March 31, 2013
	Total		Level 1		Level 2		Level 3		Before-Tax Loss
Properties, plant and equipment, net (held and used)	$	—	$	—	$	—	$	—	$	4
Properties, plant and equipment, net (held for sale)	104		—		—		104		78
Investments and advances	—		—		—		—		—
Total Assets at Fair Value	$	104	$	—	$	—	$	104	$	82