Derivatives and Risk Management Activities - Financial Impact (Details) - Derivatives Not Designated as a Hedge - Commodity Derivatives - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impact of derivative activities recognized in earnings
Total gain (loss) on derivatives recognized in net income	$ (639)	$ (297)	$ 324
Product sales revenues
Impact of derivative activities recognized in earnings
Total gain (loss) on derivatives recognized in net income	(710)	(302)	310
Field operating costs
Impact of derivative activities recognized in earnings
Total gain (loss) on derivatives recognized in net income	$ 71	$ 5	$ 14