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Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative Liabilities [Abstract]    
Gross amount recognized $ 10 $ 16
Gross amount offset in the consolidated balance sheets 0 1
Net amount presented in the consolidated balance sheets 10 15
Gross amount not offset in the consolidated balance sheets 4 1
Net amount $ 6 $ 14