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Long-Term Debt (Receivables Facility Narrative) (Details) - USD ($)
9 Months Ended
Jun. 23, 2017
Sep. 30, 2017
Dec. 31, 2016
Nov. 18, 2016
Mar. 31, 2014
Mar. 07, 2013
Mar. 21, 2012
Debt Instrument [Line Items]              
Debt   $ 13,941,000,000 $ 15,244,000,000        
Debt, noncurrent   $ 13,901,000,000 14,789,000,000        
Receivables Facility, Name [Member] | Receivables Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Issuance Date   Mar. 21, 2012          
Maximum Borrowing Capacity of Receivables Facility             $ 300,000,000
Debt   $ 532,000,000 $ 677,000,000        
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           $ 500,000,000  
Receivables Facility, March 31, 2014 Amendment [Member] | Receivables Facility [Member]              
Debt Instrument [Line Items]              
Maximum Borrowing Capacity of Receivables Facility         $ 700,000,000    
Receivables Facility, November 18, 2016 Amendment [Member] | Receivables Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Issuance Date   Nov. 18, 2016          
Maximum Borrowing Capacity of Receivables Facility       $ 450,000,000      
Receivables Facility, June 23, 2017 Amendment [Member] | Receivables Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Maturity Date   Nov. 13, 2018          
Maximum Borrowing Capacity of Receivables Facility $ 600,000,000 $ 600,000,000          
Maximum Borrowing Capacity of Receivables Facility, Long-term   600,000,000          
Outstanding Borrowings of Receivables Facility   532,000,000          
Receivables included in the Receivables Facility   $ 1,500,000,000          
Receivables Facility, Expiring November 13, 2017 [Member]              
Debt Instrument [Line Items]              
Maximum Borrowing Capacity of Receivables Facility 250,000,000            
Receivables Facility, Expiring November 13, 2017 [Member] | Receivables Facility [Member]              
Debt Instrument [Line Items]              
Extinguishment of Debt 100,000,000            
Receivables Facility, Expiring November 13, 2018 [Member] | Receivables Facility [Member]              
Debt Instrument [Line Items]              
Maximum Borrowing Capacity of Receivables Facility $ 150,000,000