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Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivative Liabilities [Abstract]    
Gross amount recognized $ 13 $ 16
Gross amount offset in the consolidated balance sheets 0 1
Net amount presented in the consolidated balance sheets 13 15
Gross amount not offset in the consolidated balance sheets 2 1
Net amount $ 11 $ 14