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Receivables (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Receivables, net
Receivables consisted of the following (in millions):
 
December 31,
 
2016
 
2015
Accounts receivable
$
5,687

 
$
4,105

Commodity derivative and foreign currency
contract receivables
129

 
147

Other receivables
117

 
247

 
5,933

 
4,499

Allowance for doubtful accounts
(32
)
 
(35
)
Receivables, net
$
5,901

 
$
4,464