Intangible Assets - Amortizable And Unamortizable Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amortizable intangible assets:
Total amortizable intangible assets, Cost	$ 393	$ 240
Total amortizable intangible assets, Accumulated Amortization	123	91
Unamortizable intangible assets:
Goodwill, Cost	717	492
Goodwill Accumulated Amortization	26	26
Total unamortizable intangible assets, Cost	737	510
Total unamortizable intangible assets, Accumulated Amortization	34	34
Trademarks and trade names
Unamortizable intangible assets:
Trademarks and trade names, Cost	20	18
Trademarks and trade names, Accumulated Amortization	8	8
Patents
Amortizable intangible assets:
Total amortizable intangible assets, Cost	14	15
Total amortizable intangible assets, Accumulated Amortization	8	8
Licenses
Amortizable intangible assets:
Total amortizable intangible assets, Cost	47	41
Total amortizable intangible assets, Accumulated Amortization	17	12
Customer relationships
Amortizable intangible assets:
Total amortizable intangible assets, Cost	255	135
Total amortizable intangible assets, Accumulated Amortization	61	44
Technical knowledge
Amortizable intangible assets:
Total amortizable intangible assets, Cost	48	25
Total amortizable intangible assets, Accumulated Amortization	15	11
Other
Amortizable intangible assets:
Total amortizable intangible assets, Cost	29	24
Total amortizable intangible assets, Accumulated Amortization	$ 22	$ 16