Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Net Pension Cost for Funded and Unfunded Plans

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

	Three months ended September 30,						Nine months ended September 30,
in millions	2013			2012			2013			2012
Interest cost on PBO	$	10		$	12		$	30		$	36
Expected return on plan assets		(17	)		(18	)		(51	)		(54	)
Amortization of losses		5			4			15			12
Settlement loss		25			—			25			—
Net pension cost (benefit)	$	23		$	(2	)	$	19		$	(6	)

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 September 30,						Nine months ended September 30,
in millions	2013			2012			2013			2012
Interest cost on APBO	$	1		$	1		$	3		$	3
Expected return on plan assets		(1	)		(1	)		(3	)		(3	)
Net postretirement benefit cost		—			—			—			—