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Receivables (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Receivables, net

Receivables consisted of the following (in millions):
 
December 31,
 
2019
 
2018
Receivables from contracts with customers
$
5,610

 
$
4,673

Receivables from certain purchase and sale arrangements
2,484

 
2,311

Commodity derivative and foreign currency
contract receivables
116

 
229

Other receivables
730

 
166

Total receivables
8,940

 
7,379

Allowance for doubtful accounts
(36
)
 
(34
)
Receivables, net
$
8,904

 
$
7,345