Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Pension Plans [Member]

Summary of Defined Benefit Plans Cost (Benefit) for All 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	2015			2014			2015			2014
Interest cost on PBO	$	10		$	12		$	30		$	36
Expected return on plan assets		(14	)		(17	)		(42	)		(51	)
Amortization of losses		4			4			13			12
Settlement loss		19			20			19			20
Net pension cost	$	19		$	19		$	20		$	17

Other Postretirement Benefit Plans [Member]

Summary of Defined Benefit Plans Cost (Benefit) for All 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	2015			2014			2015			2014
Interest cost on APBO	$	1		$	1		$	3		$	3
Expected return on plan assets		(1	)		(1	)		(2	)		(3	)
Amortization of unrecognized prior service credit		—			—			(1	)		—
Net postretirement benefit cost		—			—			—			—