Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Defined Contribution Plan Disclosures

	Three Months Ended September 30				Nine Months Ended September 30
($ in millions)	2016		2015		2016		2015
U.S. defined benefit pension contributions	$	50	$	—	$	50	$	250
Non-U.S. defined benefit pension voluntary contributions	$	—	$	—	$	—	$	21
Non-U.S. defined benefit pension mandatory contributions	$	15	$	—	$	28	$	15

Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Benefit Cost

The net periodic pension and other post-retirement benefit costs for the three and nine months ended September 30, 2016 and 2015 were as follows:

	Pensions
	Three Months Ended September 30						Nine Months Ended September 30
($ in millions)	2016			2015			2016			2015
Service cost	$	11		$	14		$	38		$	42
Interest cost	21			48			108			150
Expected return on plan assets	(31		)	(76		)	(169		)	(209		)
Amortization of actuarial losses	24			34			85			84
Amortization of prior service credit	(1		)	(1		)	(2		)	(2		)
Pension settlement charges	968			7			968			7
Curtailments and special termination benefits	—			1			—			2
Net periodic benefit cost	$	992		$	27		$	1,028		$	74

Other Postretirement Benefit Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Benefit Cost

	Other Postretirement Benefits
	Three Months Ended September 30						Nine Months Ended September 30
($ in millions)	2016			2015			2016			2015
Service cost	$	8		$	4		$	14		$	13
Interest cost	12			11			30			35
Amortization of actuarial losses	10			7			20			23
Amortization of prior service credit	(28		)	(2		)	(32		)	(7		)
Net periodic benefit cost	$	2		$	20		$	32		$	64