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Receivables, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jan. 02, 2018
Dec. 31, 2017
Receivables      
Trade accounts receivable $ 1,052   $ 1,206
Unbilled receivables 359   147
Less allowances for doubtful accounts (11)   (10)
Net trade accounts receivable 1,400   1,343
Other receivables 472   291
Receivables, net 1,872 $ 1,941 1,634
Accounts receivable available for sale under factoring programs 208   439
Maximum      
Receivables      
Accounts receivable available for sale under factoring programs $ 1,150   $ 1,000