Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Assets
Total assets:	$ 9,161	$ 8,975	$ 10,025
Reportable Segment Totals
Assets
Total assets:	8,883	8,669	9,597
Europe
Assets
Total assets:	3,744	3,588	3,842
North America
Assets
Total assets:	2,056	2,020	2,040
South America
Assets
Total assets:	1,724	1,682	1,678
Asia Pacific
Assets
Total assets:	1,359	1,379	2,037
Other
Assets
Total assets:	$ 278	$ 306	$ 428