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Receivables (Tables)
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Receivables, net
Receivables consisted of the following (in millions):
December 31,
20202019
Receivables from contracts with customers$3,642 $5,610 
Receivables from certain purchase and sale arrangements1,212 2,484 
Receivables before allowance for credit losses4,854 8,094 
Allowance for credit losses(47)(36)
Receivables after allowance for credit losses4,807 8,058 
Income taxes receivable1,024 84 
Other receivables278 846 
Receivables, net$6,109 $8,988