Intangible Assets (Amortizable And Unamortizable Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	$ 384	$ 240
Total amortizable intangible assets, Accumulated Amortization	99	91
Goodwill, Cost	698	466
Total unamortizable intangible assets, Cost	744	510
Total unamortizable intangible assets, Accumulated Amortization	34	34
Patents [Member]
Intangible Assets [Line Items]
Patents, Cost	15	15
Total amortizable intangible assets, Accumulated Amortization	8	8
Licenses [Member]
Intangible Assets [Line Items]
Licenses, Cost	43	41
Total amortizable intangible assets, Accumulated Amortization	13	12
Customer Relationships [Member]
Intangible Assets [Line Items]
Customer relationships, Cost	250	135
Total amortizable intangible assets, Accumulated Amortization	48	44
Technical Knowledge [Member]
Intangible Assets [Line Items]
Technical knowledge, Cost	48	25
Total amortizable intangible assets, Accumulated Amortization	12	11
Other [Member]
Intangible Assets [Line Items]
Other, Cost	28	24
Total amortizable intangible assets, Accumulated Amortization	18	16
Goodwill [Member]
Intangible Assets [Line Items]
Goodwill, Cost	724	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