Fair Value Measurements - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) bblPerDay d	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) bblPerDay d $ / bbl	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / bbl	May 01, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 4,958		$ 4,958		$ 4,941
Debt instrument, convertible, conversion settlement period after notice | d	25		25
Gain on disposition of assets, net	$ 1	$ 35	$ 23	$ 105
Impairment of long-lived assets			$ 22
Marketing Derivative, January 1, 2021 through December 31, 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchase contract, amount of barrel to be purchased and sold | bblPerDay	50,000		50,000
Marketing Derivative, May 1, 2022 through April 30, 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchase contract, amount of barrel to be purchased and sold | bblPerDay	40,000		40,000
Marketing Derivative, August 1, 2022 through July 31, 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchase contract, amount of barrel to be purchased and sold | bblPerDay	30,000		30,000
0.250% convertible senior notes due 2025 | Convertible debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 629		$ 629		$ 962	$ 1,300
Marketing derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fair value input, WASP differential deduction | $ / bbl			1.81		1.67