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Receivables (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]        
Accounts receivable securitization facilities $ 200      
Deferred purchase price     $ 106  
Expenses related to securitization and factoring facilities   $ 21 $ 15 $ 13
Accounts receivable securitization facilities, maximum available   $ 375    
Proceeds from accounts receivable securitization $ 106