Derivatives and Risk Management Activities - Financial Impact (Details) - Derivatives Not Designated as a Hedge - Commodity Derivatives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Impact of derivative activities recognized in earnings
Net gain/(loss) from commodity derivative activity	$ 84	$ (267)	$ (115)	$ (542)
Product sales revenues
Impact of derivative activities recognized in earnings
Net gain/(loss) from commodity derivative activity	76	(284)	(136)	(598)
Field operating costs
Impact of derivative activities recognized in earnings
Net gain/(loss) from commodity derivative activity	$ 8	$ 17	$ 21	$ 56