Stock-Based Compensation - Long-Term Incentive Plan (Details) - shares	Dec. 31, 2025	Dec. 31, 2024
NRG LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance under plan (in shares)	25,000,000	25,000,000
Number of shares available for grant under plan (in shares)	6,648,805	7,188,824
Vivint LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance under plan (in shares)	17,500,000	17,500,000
Number of shares available for grant under plan (in shares)	12,893,481	12,557,143