Intangible Assets (Amortizable And Unamortizable Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	$ 387	$ 393
Total amortizable intangible assets, Accumulated Amortization	129	123
Goodwill, Gross	701	717
Goodwill, Cost	675	691
Total unamortizable intangible assets, Cost	721	737
Total unamortizable intangible assets, Accumulated Amortization	34	34
Goodwill [Member]
Intangible Assets [Line Items]
Goodwill, Accumulated Amortization	26	26
Trademarks And Trade Names [Member]
Intangible Assets [Line Items]
Trademarks and trade names, Cost	20	20
Trademark Indefinite-lived Intangible Assets, Accumulated Amortization	8	8
Patents [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	14	14
Total amortizable intangible assets, Accumulated Amortization	8	8
Licenses [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	47	47
Total amortizable intangible assets, Accumulated Amortization	18	17
Customer Relationships [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	249	255
Total amortizable intangible assets, Accumulated Amortization	65	61
Technical Knowledge [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	48	48
Total amortizable intangible assets, Accumulated Amortization	16	15
Other [Member]
Intangible Assets [Line Items]
Total amortizable intangible assets, Cost	29	29
Total amortizable intangible assets, Accumulated Amortization	$ 22	$ 22