Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2016

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

Defined Contribution Plan Disclosures [Table Text Block]

	Three Months Ended March 31
($ in millions)	2016		2015
U.S. defined benefit pension voluntary contributions	$	—	$	250
Non-U.S. defined benefit pension plan contributions	$	6	$	26

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 months ended March 31, 2016 and 2015 were as follows:

	Pensions						Other Postretirement
	Three Months Ended March 31						Three Months Ended March 31
($ in millions)	2016			2015			2016			2015
Service cost	$	14		$	15		$	4		$	5
Interest cost	43			50			10			12
Expected return on plan assets	(69		)	(70		)	—			—
Amortization of actuarial losses	31			30			4			8
Amortization of prior service credit	—			(1		)	(2		)	(3		)
Net periodic benefit cost	$	19		$	24		$	16		$	22

Other Postretirement Benefit Plan [Member]

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

Net Periodic Benefit Cost

	Pensions						Other Postretirement
	Three Months Ended March 31						Three Months Ended March 31
($ in millions)	2016			2015			2016			2015
Service cost	$	14		$	15		$	4		$	5
Interest cost	43			50			10			12
Expected return on plan assets	(69		)	(70		)	—			—
Amortization of actuarial losses	31			30			4			8
Amortization of prior service credit	—			(1		)	(2		)	(3		)
Net periodic benefit cost	$	19		$	24		$	16		$	22