Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2014

Compensation And Retirement Disclosure [Abstract]

Net Pension Cost (Benefit) for Funded and Unfunded Plans

The components of net pension cost (benefit) for all funded and unfunded plans are as follows:

	Three months ended March 31,
in millions	2014			2013
Interest cost on PBO	$	12		$	10
Expected return on plan assets		(17	)		(17	)
Amortization of losses		4			5
Net pension cost (benefit)	$	(1	)	$	(2	)

Net Postretirement Benefit Cost for Funded and Unfunded Plans

The components of net postretirement benefit cost for all funded and unfunded plans are as follows:

	Three months ended March 31,
in millions	2014			2013
Interest cost on APBO	$	1		$	1
Expected return on plan assets		(1	)		(1	)
Net postretirement benefit cost		—			—