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Long-Term Debt (Receivables Facility Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Mar. 07, 2013
Mar. 21, 2012
Debt Instrument [Line Items]        
Debt $ 15,363 $ 16,785    
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 $ 673 $ 699    
Receivables Facility, March 7, 2013 Amendment [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Mar. 07, 2013      
Maximum Borrowing Capacity of Receivables Facility     $ 500  
Receivables Facility, November 13, 2015 Amendment [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Nov. 13, 2017      
Maximum Borrowing Capacity of Receivables Facility $ 700      
Debt 673      
Receivables included in the Receivables Facility $ 1,600