Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2017 and 2016 were as follows:

	Pension
	Three Months Ended September 30						Nine Months Ended September 30
($ in millions)	2017			2016			2017			2016
Service cost	$	8		$	9		$	25		$	34
Interest cost	25			18			74			102
Expected return on plan assets	(35		)	(26		)	(105		)	(158		)
Amortization of actuarial losses	19			21			57			79
Amortization of prior service credit	—			—			—			(1		)
Pension settlement charge	—			968			22			968
Net periodic benefit cost	$	17		$	990		$	73		$	1,024

	Other Postretirement Benefits
	Three Months Ended September 30						Nine Months Ended September 30
($ in millions)	2017			2016			2017			2016
Service cost	$	1		$	6		$	6		$	13
Interest cost	6			11			18			30
Amortization of actuarial losses	3			11			9			20
Amortization of prior service credit	(14		)	(28		)	(44		)	(32		)
Net periodic benefit (income) cost	$	(4	)	$	—		$	(11	)	$	31

Defined Contribution Plan Disclosures

	Three Months Ended September 30				Nine Months Ended September 30
($ in millions)	2017		2016		2017		2016
U.S. defined benefit pension contributions	$	—	$	50	$	29	$	50
Non-U.S. defined benefit pension mandatory contributions	$	6	$	15	$	14	$	28