Other Current Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Assets [Abstract]
Unrealized gains on derivative contracts	$ 3,108	$ 619
Deferred receivables consideration	0	446
Margin Deposit Assets	500	111
Customer Omnibus Receivable	860	1,014
Financing Receivable, after Allowance for Credit Loss	297	395
Premiums Receivable, Net	35	41
Prepaid Expense, Current	290	318
Biodiesel tax credit	101	541
Tax receivables	680	579
Other Receivables	218	369
Other current assets	135	167
Total other current assets	6,224	4,600
Financing Receivable, Allowance for Credit Loss	4	3
Interest on financing receivables	20	27	$ 26
Reinsurance Recoverables	$ 40	$ 81