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Other Assets And Liabilities (Other Current Assets) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Other Assets And Liabilities [Abstract]    
Other receivables $ 42 $ 36
Prepaid expenses 25 29
Certificates of deposit 26 27
Other current assets 2 3
Total other current assets $ 95 $ 95