Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Commodity Contract - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Natural Gas | Basis Swaps
Financial Assets:
Assets, fair value disclosure	$ 5	$ 29
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	5	29
Natural Gas | Basis Swaps | Significant Unobservable Inputs (Level 3)
Financial Assets:
Assets, fair value disclosure	0	0
Natural Gas | Price Swaps
Financial Liabilities:
Liabilities, fair value disclosure	282	703
Natural Gas | Price Swaps | Quoted Prices in Active Markets (Level 1)
Financial Liabilities:
Liabilities, fair value disclosure	0	0
Natural Gas | Price Swaps | Significant Other Observable Inputs (Level 2)
Financial Liabilities:
Liabilities, fair value disclosure	282	703
Natural Gas | Price Swaps | Significant Unobservable Inputs (Level 3)
Financial Liabilities:
Liabilities, fair value disclosure	$ 0	0
Crude Oil | Price Swaps
Financial Liabilities:
Liabilities, fair value disclosure		190
Crude Oil | Price Swaps | Quoted Prices in Active Markets (Level 1)
Financial Liabilities:
Liabilities, fair value disclosure		0
Crude Oil | Price Swaps | Significant Other Observable Inputs (Level 2)
Financial Liabilities:
Liabilities, fair value disclosure		190
Crude Oil | Price Swaps | Significant Unobservable Inputs (Level 3)
Financial Liabilities:
Liabilities, fair value disclosure		$ 0