Pension And Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Pension And Other Postretirement Benefits [Abstract]

Components Of Net Periodic Benefit Cost

	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
	(millions of dollars)
Service cost	$	11		$	10		$	1		$	2
Interest cost		26			26			9			9
Expected return on plan assets		(34	)		(31	)		(5	)		(5	)
Amortization of prior service cost		—			—			(1	)		(1	)
Amortization of net actuarial loss		14			13			5			4
Net periodic benefit cost	$	17		$	18		$	9		$	9