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Goodwill and Other Intangible Assets, Net (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Goodwill and Other Intangible Assets, Net (Textual) [Abstract]    
Amortization expense related to finite-lived intangible assets $ 2 $ 2