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Long-Term Debt (Receivables Facility Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 23, 2017
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Debt   $ 13,913 $ 15,244
Debt, noncurrent   13,880 14,789
Receivables Facility, Name [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Debt   565 $ 677
Receivables Facility, March 31, 2014 Amendment [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity of Receivables Facility $ 700    
Receivables Facility, November 13, 2015 Amendment [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity of Receivables Facility   600  
Maximum Borrowing Capacity of Receivables Facility, Long-term   600  
Debt   565  
Receivables included in the Receivables Facility   $ 1,500  
Receivables Facility, November 18, 2016 Amendment [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Issuance Date   Nov. 13, 2017  
Debt Instrument, Maturity Date   Nov. 13, 2019  
Receivables Facility, June 23, 2017 Amendment [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity of Receivables Facility 600    
Receivables Facility, Expiring November 13, 2017 [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity of Receivables Facility 250    
Extinguishment of Debt 100    
Receivables Facility, Expiring November 13, 2018 [Member] | Receivables Facility [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity of Receivables Facility $ 150