Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Employee Benefit Plans

Components of Net Periodic Benefit Expense (Income) for Pension and Other Postretirement Plans

Components of Net Periodic Benefit Expense (Income) for Pension and Other Postretirement Plans
		Three Months Ended
		March 31,
$ in millions		2018		2017
Service cost, benefits earned during the period	$	4	$	4
Interest cost on projected benefit obligation		34		37
Expected return on plan assets		(28)		(29)
Net amortization of prior service credit		—		(4)
Net amortization of actuarial loss		6		4
Net periodic benefit expense (income)	$	16	$	12