Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Assets
Total assets:	$ 7,326	$ 7,858	$ 8,488
Reportable Segment Totals
Assets
Total assets:	7,007	7,512	8,235
Europe
Assets
Total assets:	2,935	3,223	3,585
North America
Assets
Total assets:	2,033	1,971	2,055
South America
Assets
Total assets:	1,097	1,300	1,453
Asia Pacific
Assets
Total assets:	942	1,018	1,142
Other
Assets
Total assets:	$ 319	$ 346	$ 253