Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Employee Benefits [Abstract]

Net pension cost for all funded and unfunded plans

	Three months ended March 31,
in millions	2012		2011
Interest cost on PBO	$	12	$	14
Expected return on plan assets		(18)		(20)
Amortization of losses		4		3
Net pension cost	$	(2)	$	(3)

Net postretirement benefit cost for all funded and unfunded plans

	Three months ended March 31,
in millions	2012		2011
Interest cost on APBO	$	1	$	1
Expected return on plan assets		(1)		(1)
Net postretirement benefit cost		—		—