Goodwill - Goodwill Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period		$ 2,489	$ 1,893	$ 2,059
Acquisitions		41	796
Translation effects		(68)	(200)	(166)
Balance of Goodwill at end of the period	$ 2,462	2,462	2,489	1,893
Impairment charge	0
Europe
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period		840	926	1,044
Translation effects		(32)	(86)	(118)
Balance of Goodwill at end of the period	808	808	840	926
North America
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period		1,020	723	734
Acquisitions		15	316
Translation effects		3	(19)	(11)
Balance of Goodwill at end of the period	1,038	1,038	1,020	723
Latin America
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period		624	239	276
Acquisitions		26	480
Translation effects		(39)	(95)	(37)
Balance of Goodwill at end of the period	611	611	624	239
Other.
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period		5	5	5
Balance of Goodwill at end of the period	5	5	5	5
Asia Pacific
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period		0	0
Balance of Goodwill at end of the period	0	0	0	0
Accumulated impairment losses	$ 1,135	$ 1,135	$ 1,135	$ 1,135