Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Commodity Contract - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Natural Gas | Basis Swaps
Financial Assets:
Assets, fair value disclosure	$ 2	$ 2
Natural Gas | Basis Swaps | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure	0	0
Natural Gas | Basis Swaps | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure	2	2
Natural Gas | Basis Swaps | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	0	0
Natural Gas | Price Swaps
Financial Assets:
Assets, fair value disclosure		105
Financial Liabilities:
Liabilities, fair value disclosure	73	104
Natural Gas | Price Swaps | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure		0
Financial Liabilities:
Liabilities, fair value disclosure	0	0
Natural Gas | Price Swaps | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure		105
Financial Liabilities:
Liabilities, fair value disclosure	73	104
Natural Gas | Price Swaps | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure		0
Financial Liabilities:
Liabilities, fair value disclosure	0	$ 0
Brent Crude Oil (Brent) Linked Gas Sales Contract
Financial Assets:
Assets, fair value disclosure	148
Brent Crude Oil (Brent) Linked Gas Sales Contract | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure	0
Brent Crude Oil (Brent) Linked Gas Sales Contract | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure	0
Brent Crude Oil (Brent) Linked Gas Sales Contract | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	$ 148