Pension And Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Components Of Net Periodic Benefit Cost

	Pension Benefits						Other Postretirement Benefits
	2013			2012			2013			2012
	(millions of dollars)
Service cost	$	13		$	11		$	2		$	1
Interest cost		25			26			8			9
Expected return on plan assets		(37	)		(34	)		(5	)		(5	)
Amortization of prior service cost		—			—			(1	)		(1	)
Amortization of net actuarial loss		16			14			4			5
Net periodic benefit cost	$	17		$	17		$	8		$	9