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Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Receivables    
Accounts receivable $ 5,687 $ 4,105
Commodity derivative and foreign currency contract receivables 129 147
Other receivables 117 247
Receivables, gross 5,933 4,499
Allowance for doubtful accounts (32) (35)
Receivables, net $ 5,901 $ 4,464