Investments, Loans and Long-Term Receivables - WRB Refining LP (WRB) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 12,832	$ 13,037
WRB Refining LP
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	50.00%	50.00%
Amortization period	26 years
Equity investments, basis difference	$ 2,062
Equity investment, amortization of basis difference	186	$ 180	$ 182
Equity investments	1,652	1,819
Outstanding related party loan balance	$ 595	$ 277

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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+ Details