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Financial Instruments And Risk Management Financial Instruments And Risk Management (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Interest Rate Derivatives, at Fair Value, Net $ (35) $ (47)
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 41 47
Derivative Asset   3
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 6 0
Maximum length of time hedged in balance sheet hedge 30 days  
Maximum Length of Time Hedged in Cash Flow Hedge 30 months  
Derivative Liability $ 1 $ 7
Balance Sheet Hedge [Member]    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Derivative, Notional Amount 108  
Cash Flow Hedging [Member]    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Cash flow hedge 16  
Maximum [Member]    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Derivative Asset $ 1