Business Segments - Rationalizations, Asset Sales, Other Expense and Asset Write-offs and Accelerated Depreciation Attributable to the SBUs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Rationalizations	$ 135	$ 210	$ 114
Net (gains) losses on asset sales	(14)	(31)	(71)
Asset write-offs and accelerated depreciation	40	20	8
Americas
Segment Reporting Information [Line Items]
Asset write-offs and accelerated depreciation	0	1	0
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Asset write-offs and accelerated depreciation	40	19	8
Asia Pacific
Segment Reporting Information [Line Items]
Asset write-offs and accelerated depreciation	0	0	0
Operating Segments
Segment Reporting Information [Line Items]
Rationalizations	119	200	114
Net (gains) losses on asset sales	(14)	(22)	7
Operating Segments | Americas
Segment Reporting Information [Line Items]
Rationalizations	6	15	15
Net (gains) losses on asset sales	(4)	(4)	(2)
Operating Segments | Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Rationalizations	111	184	95
Net (gains) losses on asset sales	(10)	(17)	14
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Rationalizations	2	1	4
Net (gains) losses on asset sales	0	(1)	(5)
Corporate
Segment Reporting Information [Line Items]
Rationalizations	16	10	0
Net (gains) losses on asset sales	$ 0	$ (9)	(78)
SRI
Segment Reporting Information [Line Items]
Net (gains) losses on asset sales			(48)
SRI | Corporate
Segment Reporting Information [Line Items]
Net (gains) losses on asset sales			(48)
Pre-tax gain on sale of common stock in SRI			$ 30