Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended												12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 North America	Dec. 31, 2011 North America	Dec. 31, 2010 North America	Dec. 31, 2012 Europe	Dec. 31, 2011 Europe	Dec. 31, 2010 Europe	Dec. 31, 2011 Asia Pacific	Dec. 31, 2010 Asia Pacific	Dec. 31, 2012 Asia Pacific	Dec. 31, 2012 South America	Dec. 31, 2011 South America	Dec. 31, 2010 South America	Dec. 31, 2012 Other	Dec. 31, 2011 Other	Dec. 31, 2010 Other	Dec. 31, 2009 Other
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	$ 2,082	$ 2,821	$ 2,381	$ 740	$ 743	$ 736	$ 983	$ 1,009	$ 1,081	$ 677	$ 559		$ 354	$ 387		$ 5	$ 5	$ 5	$ 5
Acquisitions		8	429					8			53				376
Charge for goodwill impairment		(641)								(641)
Translation effects	(3)	(106)	11	3	(3)	7	23	(34)	(72)	(36)	65		(29)	(33)	11
Balance of Goodwill at end of period	2,079	2,082	2,821	743	740	743	1,006	983	1,009		677		325	354	387	5	5	5	5
Accumulated impairment losses										$ 1,135	$ 494	$ 1,135