Pensions and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

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 six months ended June 30, 2020 and 2019 were as follows:

	Pension
	Three Months Ended June 30		Six Months Ended June 30
($ in millions)	2020	2019	2020	2019
Service cost	$6	$5	$12	$11
Interest cost	21	27	43	53
Expected return on plan assets	(36)	(35)	(72)	(70)
Amortization of actuarial losses	18	16	36	31
Curtailments	1	—	1	—
Net periodic benefit cost	$10	$13	$20	$25

Defined Contribution Plan Disclosures

	Three Months Ended June 30		Six Months Ended June 30
($ in millions)	2020	2019	2020	2019
Non-U.S. defined benefit pension mandatory contributions	$3	$3	$5	$6