Derivatives and Risk Management Activities - Financial Impact (Details) - Derivatives Not Designated as a Hedge - Commodity Derivatives - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Impact of derivative activities recognized in earnings
Net loss from commodity derivative activity	$ (200)	$ (275)
Product sales revenues
Impact of derivative activities recognized in earnings
Net loss from commodity derivative activity	(213)	(314)
Field operating costs
Impact of derivative activities recognized in earnings
Net loss from commodity derivative activity	$ 13	$ 39