Pensions and Other Postretirement Benefits (Tables) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2016

Jun. 30, 2015

Jun. 30, 2016

Jun. 30, 2015

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

Defined Contribution Plan Disclosures [Table Text Block]

	Three Months Ended June 30				Six Months Ended June 30
($ in millions)	2016		2015		2016		2015
U.S. defined benefit pension voluntary contributions	$	—	$	—	$	—	$	250
Non-U.S. defined benefit pension voluntary contributions	$	—	$	—	$	—	$	21
Non-U.S. defined benefit pension mandatory contributions	$	7	$	—	$	13	$	12

Pension Plan [Member]

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

Amortization of actuarial losses

$ 31

$ 25

$ 62

$ 55

Net Periodic Benefit Cost

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

	Pensions
	Three Months Ended June 30						Six Months Ended June 30
($ in millions)	2016			2015			2016			2015
Service cost	$	13		$	15		$	27		$	30
Interest cost	44			53			87			103
Expected return on plan assets	(69		)	(69		)	(138		)	(139		)
Amortization of actuarial losses	31			25			62			55
Amortization of prior service credit	(1		)	—			(1		)	(1		)
Curtailments and special termination benefits	—			1			—			1
Net periodic benefit cost	$	18		$	25		$	37		$	49

Amortization of prior service cost

(1)

0

$ (1)

(1)

Other Postretirement Benefit Plan [Member]

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

Amortization of actuarial losses

5

8

$ 9

16

Net Periodic Benefit Cost

	Pensions
	Three Months Ended June 30						Six Months Ended June 30
($ in millions)	2016			2015			2016			2015
Service cost	$	13		$	15		$	27		$	30
Interest cost	44			53			87			103
Expected return on plan assets	(69		)	(69		)	(138		)	(139		)
Amortization of actuarial losses	31			25			62			55
Amortization of prior service credit	(1		)	—			(1		)	(1		)
Curtailments and special termination benefits	—			1			—			1
Net periodic benefit cost	$	18		$	25		$	37		$	49

Amortization of prior service cost

$ (2)

$ (2)

$ (4)

$ (5)