Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Other Assets [Abstract]
Derivative Asset	$ 2,619		$ 3,108
Margin Deposit Assets	624		500
Receivables from Customers	924		860
Financing Receivable, after Allowance for Credit Loss	215		297
Premiums Receivable, Net	21		35
Prepaid Expense, Current	370		290
Biodiesel tax credit	118		101
Tax receivables	637		680
Other Receivables	450		218
Other current assets	176		135
Total other current assets	6,154		6,224
Financing Receivable, Allowance for Credit Loss	4		4
Interest on financing receivables	4	$ 8
Reinsurance Recoverables	$ 38		$ 40