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Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
Receivables      
Trade accounts receivable $ 1,332   $ 1,206
Unbilled receivables 429   147
Less allowances for doubtful accounts (10)   (10)
Net trade accounts receivable 1,751   1,343
Other receivables 339   291
Receivables, net 2,090 $ 1,941 1,634
Accounts receivable available for sale under factoring programs 211   $ 439
Maximum      
Receivables      
Accounts receivable available for sale under factoring programs $ 800