Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Net Pension 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	2016			2015			2016			2015
Interest cost on PBO	$	10		$	10		$	31		$	30
Expected return on plan assets	(13		)	(14		)	(39		)	(42		)
Amortization of losses	4			4			12			13
Settlement loss	—			19			—			19
Net pension cost	$	1		$	19		$	4		$	20

Net Postretirement Benefit Cost 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	2016			2015			2016			2015
Service Cost	$	1		—			$	1		—
Interest cost on APBO	—			$	1		2			$	3
Expected return on plan assets	—			(1		)	(2		)	(2		)
Amortization of unrecognized prior service credit	(1		)	—			(1		)	(1		)
Net postretirement benefit cost	—			—			—			—