Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Other Assets [Abstract]
Derivative Asset	$ 2,281		$ 2,281		$ 3,108
Margin Deposit Assets	609		609		500
Receivables from Customers	1,038		1,038		860
Financing Receivable, after Allowance for Credit Loss	142		142		297
Premiums Receivable, Net	64		64		35
Prepaid Expense, Current	361		361		290
Biodiesel tax credit	99		99		101
Tax receivables	578		578		680
Other Receivables	294		294		218
Other current assets	131		131		135
Total other current assets	5,597		5,597		6,224
Financing Receivable, Allowance for Credit Loss	4		4		4
Interest on financing receivables	2	$ 3	6	$ 11
Reinsurance Recoverables	$ 66		$ 66		$ 40