Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2012

Accumulated Other Comprehensive Loss [Abstract]

Schedule Of The Components Of Other Comprehensive Loss

	Commodity Derivatives			Treasury Lock			Prior Service Costs			Total
	(millions of dollars)
Balance, December 31, 2011	$	(29	)	$	(10	)	$	(24	)	$	(63	)
Current year change		8			—			—			8
Balance, March 31, 2012	$	(21	)	$	(10	)	$	(24	)	$	(55	)

Schedule Of Income Tax Expense (Benefit) Allocated To Accumulated Other Comprehensive Income Loss

	Commodity Derivatives  (a)		Treasury Lock (b)		Prior Service Costs (b)		Total
	(millions of dollars)
For the three months ended March 31, 2012	$	5	$	—	$	1	$	6
For the three months ended March 31, 2011	$	11	$	—	$	—	$	11

(a) Includes tax expense for losses reclassified to income during the three months ended March 31, 2012 and 2011, of $5 million and $11 million, respectively.

(b) No material income tax effect of losses reclassified to income in the current period.