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Stock-Based Compensation - Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock-Based Compensation
Minimum tax withholdings	$ 50	$ 22	$ 6
Compensation Expense	145	123	34
Tax (benefit)/detriment recognized	(14)	2	3
Unrecognized Total Cost	$ 153
RSUs
Stock-Based Compensation
Award vesting period	3 years
RSUs | NRG LTIP
Stock-Based Compensation
Compensation Expense	$ 29	20	15
Unrecognized Total Cost	$ 17
Weighted Average Recognition Period Remaining (In years)	1 year 6 months 7 days
RSUs | Vivint LTIP
Stock-Based Compensation
Compensation Expense	$ 56	76	0
Unrecognized Total Cost	$ 48
Weighted Average Recognition Period Remaining (In years)	1 year 3 months 25 days
Award vesting period	4 years
PSUs | Vivint LTIP
Stock-Based Compensation
Compensation Expense	$ 3	2	0
Unrecognized Total Cost	$ 5
Weighted Average Recognition Period Remaining (In years)	1 year 6 months 18 days
DSUs
Stock-Based Compensation
Compensation Expense	$ 3	2	2
Unrecognized Total Cost	$ 0
Weighted Average Recognition Period Remaining (In years)	0 years
RPSUs under NRG LTIP
Stock-Based Compensation
Compensation Expense	$ 11	3	11
Unrecognized Total Cost	$ 15
Weighted Average Recognition Period Remaining (In years)	1 year 2 months 1 day
Award vesting period	3 years
PRSUs
Stock-Based Compensation
Award vesting period	3 years
PRSUs | NRG LTIP
Stock-Based Compensation
Compensation Expense	$ 43	$ 20	$ 6
Unrecognized Total Cost	$ 68
Weighted Average Recognition Period Remaining (In years)	1 year 3 months 29 days

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