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Stock-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions	Jan. 30, 2026	Mar. 31, 2026
2025 SM Equity Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for grant (in shares)		3.0
2024 Civitas Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for grant (in shares)		3.7
Restricted Stock Units (RSUs) | Civitas Resources Merger
Share-based Compensation Arrangement by Share-based Payment Award
Shares issued in conversion	2.5
Aggregate fair value	$ 49
Unrecognized stock-based compensation	$ 20

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