Segment and Geographic Area Information (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Revenues from external customers	$ 7,205	$ 5,937	$ 4,649
Long-lived assets	1,160	1,165	1,229
Total assets	3,337	3,167	2,841
United States [Member]
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Revenues from external customers	2,795	2,275	1,531
Long-lived assets	359	352	373
Total assets	1,280	1,147	984
Germany [Member]
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Revenues from external customers for Foreign countries	826	616	559
Long-lived assets for Foreign countries	110	109	116
Total assets for Foreign countries	347	322	409
Canada [Member]
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Revenues from external customers for Foreign countries	343	327	416
Long-lived assets for Foreign countries	57	64	75
Total assets for Foreign countries	163	149	125
China [Member]
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Revenues from external customers for Foreign countries	567	473	361
Long-lived assets for Foreign countries	104	76	61
Total assets for Foreign countries	387	321	249
Other Foreign [Member]
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Revenues from external customers for Foreign countries	2,674	2,246	1,782
Long-lived assets for Foreign countries	530	564	604
Total assets for Foreign countries	1,251	1,308	1,153
Reclass and Elims for Geog [Member]
Revenues from External Customer, Long-lived Assets, and Total Assets by Geographic Area [Abstract]
Total assets	$ (91)	$ (80)	$ (79)