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Receivables
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
RECEIVABLES
4.
RECEIVABLES

Receivables consisted of the following (in millions):
 
December 31,
 
2018
 
2017
Receivables from contracts with customers
$
4,673

 
$
5,686

Receivables from certain purchase and sale arrangements
2,311

 
1,098

Commodity derivative and foreign currency
contract receivables
229

 
102

Other receivables
166

 
69

Total receivables
7,379

 
6,955

Allowance for doubtful accounts
(34
)
 
(33
)
Receivables, net
$
7,345

 
$
6,922



There were no significant changes in our allowance for doubtful accounts during the years ended December 31, 2018, 2017, and 2016.