Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Commodity Contract - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Natural Gas Swaps | Price Swaps
Financial Assets:
Assets, fair value disclosure	$ 34	$ 12
Financial Liabilities:
Liabilities, fair value disclosure		1
Natural Gas Swaps | Price Swaps | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure	0	0
Financial Liabilities:
Liabilities, fair value disclosure		0
Natural Gas Swaps | Price Swaps | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure	34	12
Financial Liabilities:
Liabilities, fair value disclosure		1
Natural Gas Swaps | Price Swaps | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	0	0
Financial Liabilities:
Liabilities, fair value disclosure		0
Natural Gas Swaps | Brent Linked Gas Sales Contract
Financial Assets:
Assets, fair value disclosure	161	31
Natural Gas Swaps | Brent Linked Gas Sales Contract | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure	0	0
Natural Gas Swaps | Brent Linked Gas Sales Contract | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure	0	0
Natural Gas Swaps | Brent Linked Gas Sales Contract | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	161	31
Natural Gas Collars | Natural Gas Collars
Financial Assets:
Assets, fair value disclosure	14	4
Financial Liabilities:
Liabilities, fair value disclosure		1
Natural Gas Collars | Natural Gas Collars | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure	0	0
Financial Liabilities:
Liabilities, fair value disclosure		0
Natural Gas Collars | Natural Gas Collars | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure	14	4
Financial Liabilities:
Liabilities, fair value disclosure		1
Natural Gas Collars | Natural Gas Collars | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	0	0
Financial Liabilities:
Liabilities, fair value disclosure		0
NGL Swaps | Price Swaps
Financial Assets:
Assets, fair value disclosure	1	2
NGL Swaps | Price Swaps | Quoted Prices in Active Markets (Level 1)
Financial Assets:
Assets, fair value disclosure	0	0
NGL Swaps | Price Swaps | Significant Other Observable Inputs (Level 2)
Financial Assets:
Assets, fair value disclosure	1	2
NGL Swaps | Price Swaps | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	$ 0	$ 0