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Receivables
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
RECEIVABLES
3.
RECEIVABLES

Receivables consisted of the following (in millions):
 
December 31,
 
2017
 
2016
Accounts receivable
$
6,786

 
$
5,687

Commodity derivative and foreign currency
contract receivables
102

 
129

Other receivables
67

 
117

 
6,955

 
5,933

Allowance for doubtful accounts
(33
)
 
(32
)
Receivables, net
$
6,922

 
$
5,901



There were no significant changes in our allowance for doubtful accounts during the years ended December 31, 2017, 2016, and 2015.