Commitments and Contingencies - RFS (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Loss Contingencies [Line Items]
Expense (benefit) for compliance with RFS	$ 48	$ 135	$ 37	$ 241
RFS obligation	$ 599		$ 599		$ 692