Fair Value Measurements - Narrative (Details) MMBTU in Thousands, $ in Millions	1 Months Ended	12 Months Ended
	Feb. 22, 2024 MMBTU	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract]
Proved oil and gas properties carrying amount		$ 59	$ 146	$ 27
Assets written down during the period - fair value at end of period		15	26	7
Pretax impairment charges		44	120	$ 20
Debt Disclosure [Abstract]
Aggregate principal amount of current and long-term debt		3,640	4,890
Estimated fair value of debt		$ 3,574	$ 4,740
Subsequent Event
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Sales agreement term	10 years
Agreement to sell domestic gas production | MMBTU	180
Agreement to sell at a price indexed to Brent Crude Oil | MMBTU	140