Pensions and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2019 and 2018 were as follows:

	Pension
	Three Months Ended June 30						Six Months Ended June 30
($ in millions)	2019			2018			2019			2018
Service cost		$5			$8			$11			$16
Interest cost	27			24			53			48
Expected return on plan assets	(35		)	(38		)	(70		)	(76		)
Amortization of actuarial losses	16			16			31			32
Net periodic benefit cost		$13			$10			$25			$20

	Other Postretirement Benefits
	Three Months Ended June 30						Six Months Ended June 30
($ in millions)	2019			2018			2019			2018
Service cost		$2			$3			$4			$5
Interest cost	7			6			13			12
Amortization of actuarial losses	2			4			4			9
Amortization of prior service credit	(15		)	(15		)	(29		)	(30		)
Net periodic benefit cost		($4	)		($2	)		($8	)		($4	)

Defined Contribution Plan Disclosures

	Three Months Ended June 30				Six Months Ended June 30
($ in millions)	2019		2018		2019		2018
U.S. defined benefit pension contributions		$—		$—		$—		$25
Non-U.S. defined benefit pension mandatory contributions		$3		$5		$6		$10