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Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Receivables    
Trade accounts receivable $ 1,342 $ 1,169
Less allowances for doubtful accounts (10) (11)
Net trade accounts receivable 1,332 1,158
Other receivables 305 333
Receivables, net 1,637 1,491
Maximum available sale of the accounts receivables under factoring program 1,000  
Amount of sale of receivables $ 658 $ 596