Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Benefit Cost

The net periodic pension and other postretirement benefit costs for the three months ended March 31, 2018 and 2017 were as follows:

	Pension						Other Postretirement Benefits
	Three Months Ended March 31						Three Months Ended March 31
($ in millions)	2018			2017			2018			2017
Service cost		$8			$9			$2			$2
Interest cost	24			24			6			7
Expected return on plan assets	(38		)	(34		)	—			—
Amortization of actuarial losses	16			19			5			5
Amortization of prior service credit	—			—			(15		)	(13		)
Pension settlement charge	—			22			—			—
Net periodic benefit cost		$10			$40			($2	)		$1

Defined Contribution Plan Disclosures

	Three Months Ended March 31
($ in millions)	2018		2017
U.S. defined benefit pension contributions		$25		$29
Non-U.S. defined benefit pension mandatory contributions		$5		$5