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Accounts Receivable Factoring and Other Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from Sale of Notes Receivable $ 59      
Proceeds from sale of accounts receivable     $ 278  
Gain (loss) on sale of accounts receivable     (2) $ (1)
Accounts receivable sold, carrying value     $ 284 $ 150
Trade receivables held-for-sale, reconciliation to cash flow, deductions from held-for-sale   $ 65    
Receivable with imputed interest, face amount   $ 65    
Receivable with imputed interest, term   3 years    
Receivable with imputed interest, effective yield (interest rate)   4.625%    
Notes receivable, fair value disclosure   $ 58