Pensions and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017 and 2016 were as follows:

	Pension
	Three Months Ended June 30						Six Months Ended June 30
($ in millions)	2017			2016			2017			2016
Service cost	$	8		$	12		$	17		$	25
Interest cost	25			41			49			84
Expected return on plan assets	(36		)	(65		)	(70		)	(132		)
Amortization of actuarial losses	19			29			38			58
Amortization of prior service credit	—			(1		)	—			(1		)
Pension settlement charge	—			—			22			—
Net periodic benefit cost	$	16		$	16		$	56		$	34

	Other Postretirement Benefits
	Three Months Ended June 30						Six Months Ended June 30
($ in millions)	2017			2016			2017			2016
Service cost	$	3		$	3		$	5		$	7
Interest cost	5			9			12			19
Amortization of actuarial losses	1			5			6			9
Amortization of prior service credit	(17		)	(2		)	(30		)	(4		)
Net periodic benefit (income) cost	$	(8	)	$	15		$	(7	)	$	31

Defined Contribution Plan Disclosures

	Three Months Ended June 30				Six Months Ended June 30
($ in millions)	2017		2016		2017		2016
U.S. defined benefit pension contributions	$	—	$	—	$	29	$	—
Non-U.S. defined benefit pension mandatory contributions	$	3	$	7	$	8	$	13