Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [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 March 31,
in millions	2018			2017
Interest cost on PBO	$	10		$	12
Expected return on plan assets	(13		)	(17		)
Amortization of losses	4			4
Net pension cost	$	1		$	(1	)