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Long-Term Debt (Receivables Facility Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 07, 2013
Mar. 21, 2012
Debt Instrument [Line Items]        
Debt $ 15,245,000,000 $ 15,244,000,000    
Debt, noncurrent $ 14,687,000,000 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 $ 700,000,000 $ 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, November 13, 2015 Amendment [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Nov. 13, 2018      
Maximum Borrowing Capacity of Receivables Facility $ 700,000,000      
Maximum Borrowing Capacity of Receivables Facility, Long-term 450,000,000      
Maximum Borrowing Capacity of Receivables Facility, Short-term 250,000,000      
Receivables included in the Receivables Facility $ 1,900,000,000      
Receivables Facility, November 18, 2016 Amendment [Member] | Receivables Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Nov. 18, 2016      
Debt Instrument, Maturity Date Nov. 13, 2017      
Maximum Borrowing Capacity of Receivables Facility $ 450,000,000