Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

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 and nine months ended September 30, 2019 and 2018 were as follows:

	Pension
	Three Months Ended September 30						Nine Months Ended September 30
($ in millions)	2019			2018			2019			2018
Service cost		$6			$8			$17			$24
Interest cost	26			23			79			71
Expected return on plan assets	(35		)	(37		)	(105		)	(113		)
Amortization of actuarial losses	16			16			47			48
Net periodic benefit cost		$13			$10			$38			$30

	Other Postretirement Benefits
	Three Months Ended September 30						Nine Months Ended September 30
($ in millions)	2019			2018			2019			2018
Service cost		$3			$2			$7			$7
Interest cost	6			6			19			18
Amortization of actuarial losses	2			5			6			14
Amortization of prior service credit	(14		)	(15		)	(43		)	(45		)
Net periodic benefit cost		($3	)		($2	)		($11	)		($6	)

Defined Contribution Plan Disclosures

	Three Months Ended September 30				Nine Months Ended September 30
($ in millions)	2019		2018		2019		2018
U.S. defined benefit pension contributions		$—		$50		$—		$75
Non-U.S. defined benefit pension mandatory contributions		$2		$4		$8		$14