Costs Associated with Rationalization Programs - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) employee	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance	$ 116		$ 116		$ 213
Rationalizations	(2)	$ 27	35	$ 56
Rationalization reversals	7		12
Rationalization charges incurred to date					$ 730
Rationalization charges expected to be incurred in future periods	16		$ 16
Expected number of positions eliminated | employee			600
Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	3	$ 32	26
Expected number of positions eliminated | employee			300
Number of positions eliminated | employee			100
Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	(3)	24	$ 3	30
Number of positions eliminated | employee			300
Employee Severance
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance	44		$ 44
Employee Severance | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	1		26
EMEA Restructuring, Manufacturing Employee Severance
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance	40		40
Philippsburg Restructuring
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance	8		8
Philippsburg Restructuring | Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	2	18	9	20
Europe, Middle East, and Africa Restructuring Plan - Operating Efficiency
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance	$ 11		11
Europe, Middle East, and Africa Restructuring Plan - Operating Efficiency | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		1	$ 6	7
EMEA Restructuring, SAG Employee Severance | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		2		19
Wolverhampton Restructuring Plan | Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		$ 2		$ 5
Amiens Restructuring Plan | Amiens Labor Claims
Restructuring Cost and Reserve [Line Items]
Loss contingency, number of plaintiffs | employee			850