Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Disclosures Table [Abstract]

Fair Value Disclosure Table

Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table summarizes assets and liabilities measured at fair value on a recurring basis:
	Fair Value Measurements Using
(Millions of dollars)	Level 1		Level 2		Level 3
	March 31,	December 31,	March 31,	December 31,	March 31,	December 31,
	2012	2011	2012	2011	2012	2011
Assets
Derivative assets	-	-	$32	$37	-	-
Liabilities
Derivative liabilities	-	-	$1	$4	-	-