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Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Derivative Liabilities [Abstract]    
Gross amount recognized $ 5 $ 23
Gross amount offset in the consolidated balance sheets 0 0
Net amount presented in the consolidated balance sheets 5 23
Gross amount not offset in the consolidated balance sheets 1 4
Net amount $ 4 $ 19