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Receivables (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Receivables    
Trade accounts receivable $ 1,529 $ 759
Less allowances for doubtful accounts (5) (5)
Net trade accounts receivable 1,524 754
Other receivables 386 131
Receivables, net 1,910 885
Maximum available sale of the accounts receivables under factoring program 789  
Amount of sale of receivables $ 748 $ 479