Business Segments - Charges and Credits Attributable to the SBUs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Rationalizations	$ 46	$ 135	$ 102	$ 194
Net (gains) losses on asset sales	(1)	(27)	(14)	(28)
Asset write-offs and accelerated depreciation	10	3	39	10
Americas
Segment Reporting Information [Line Items]
Asset write-offs and accelerated depreciation	0	1	0	1
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Asset write-offs and accelerated depreciation	10	2	39	9
Operating Segments
Segment Reporting Information [Line Items]
Rationalizations	30	132	86	190
Net (gains) losses on asset sales	(1)	(18)	(14)	(19)
Operating Segments | Americas
Segment Reporting Information [Line Items]
Rationalizations	4	6	6	10
Net (gains) losses on asset sales	(1)	0	(4)	0
Operating Segments | Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Rationalizations	25	126	78	179
Net (gains) losses on asset sales	0	(18)	(10)	(18)
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Rationalizations	1	0	2	1
Net (gains) losses on asset sales	0	0	0	(1)
Corporate
Segment Reporting Information [Line Items]
Rationalizations	16	3	16	4
Net (gains) losses on asset sales	$ 0	$ (9)	$ 0	$ (9)