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Long-Term Debt (Receivables Facility Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Mar. 07, 2013
Mar. 21, 2012
Debt Instrument [Line Items]        
Debt $ 16,867 $ 16,916    
Receivables Facility, Name [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Mar. 21, 2012      
Maximum Borrowing Capacity of Receivables Facility       $ 300
Debt $ 606 $ 614    
Receivables Facility, March 7, 2013 Amendment [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Mar. 07, 2013      
Debt Instrument, Maturity Date Mar. 21, 2017      
Maximum Borrowing Capacity of Receivables Facility     $ 500  
Receivables Facility, March 31, 2014 Amendment [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Maximum Borrowing Capacity of Receivables Facility $ 700      
Debt 606      
Receivables included in the Receivables Facility $ 1,300