Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Other Assets [Abstract]
Derivative Asset	$ 1,843		$ 1,843		$ 3,108
Margin Deposit Assets	580		580		500
Receivables from Customers	1,075		1,075		860
Financing Receivable, after Allowance for Credit Loss	154		154		297
Premiums Receivable, Net	17		17		35
Prepaid Expense, Current	325		325		290
Biodiesel tax credit	40		40		101
Tax receivables	765		765		680
Other Receivables	270		270		218
Other current assets	151		151		135
Total other current assets	5,220		5,220		6,224
Financing Receivable, Allowance for Credit Loss	3		3		4
Interest on financing receivables	2	$ 4	8	$ 15
Reinsurance Recoverables	$ 28		$ 28		$ 40