Share-Based Compensation - Schedule of Compensation Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	$ 16	$ 21	$ 29	$ 32
Related income tax benefit	4	7	8	9
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	10	9	18	17
Natural gas and oil properties
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	3	2	4	4
Production expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	1	1	2	2
Separation and other termination costs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	0	9	0	9
Marketing expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	1	0	2	0
Other operating expense, net
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total RSU and PSU compensation	$ 1	$ 0	$ 3	$ 0