Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Assets
Total assets:	$ 8,834	$ 8,975	$ 10,193
Reportable Segment Totals
Assets
Total assets:	8,500	8,669	9,907
Europe
Assets
Total assets:	3,544	3,588	3,954
North America
Assets
Total assets:	2,055	2,020	2,042
South America
Assets
Total assets:	1,583	1,682	1,802
Asia Pacific
Assets
Total assets:	1,318	1,379	2,109
Other
Assets
Total assets:	$ 334	$ 306	$ 286