Property, Plant and Equipment, Net (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Depreciation and Amortization $ 455 $ 444 $ 414
Property Plant and Equipment [Member]
     
Depreciation and Amortization $ 318 $ 314 $ 304