Intangible Assets (Amortizable And Unamortizable Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	$ 393	$ 240
Total amortizable intangible assets, Accumulated Amortization	116	91
Goodwill, Cost	689	466
Total unamortizable intangible assets, Cost	735	510
Total unamortizable intangible assets, Accumulated Amortization	34	34
Goodwill [Member]
Intangible Assets [Line Items]
Goodwill, Cost	715	492
Total unamortizable intangible assets, Accumulated Amortization	26	26
Trademarks And Trade Names [Member]
Intangible Assets [Line Items]
Trademarks and trade names, Cost	20	18
Total unamortizable intangible assets, Accumulated Amortization	8	8
Patents [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	14	15
Total amortizable intangible assets, Accumulated Amortization	8	8
Licenses [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	47	41
Total amortizable intangible assets, Accumulated Amortization	16	12
Customer Relationships [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	254	135
Total amortizable intangible assets, Accumulated Amortization	57	44
Technical Knowledge [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	49	25
Total amortizable intangible assets, Accumulated Amortization	14	11
Other [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	29	24
Total amortizable intangible assets, Accumulated Amortization	$ 21	$ 16