Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 North America	Dec. 31, 2010 North America	Dec. 31, 2009 North America	Dec. 31, 2011 Europe	Dec. 31, 2010 Europe	Dec. 31, 2009 Europe	Dec. 31, 2011 Asia Pacific	Dec. 31, 2010 Asia Pacific	Dec. 31, 2009 Asia Pacific	Dec. 31, 2011 South America	Dec. 31, 2010 South America	Dec. 31, 2011 Other	Dec. 31, 2010 Other	Dec. 31, 2009 Other	Dec. 31, 2008 Other
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	$ 2,821	$ 2,381	$ 2,207	$ 743	$ 736	$ 717	$ 1,009	$ 1,081	$ 1,051	$ 677	$ 559	$ 434	$ 387		$ 5	$ 5	$ 5	$ 5
Acquisitions	8	429					8				53			376
Impairment charge	(641)									(641)
Translation effects	(106)	11	174	(3)	7	19	(34)	(72)	30	(36)	65	125	(33)	11
Balance of Goodwill, at end of period	2,082	2,821	2,381	740	743	736	983	1,009	1,081		677	559	354	387	5	5	5	5
Accumulated impairment losses										$ 1,135	$ 494	$ 494