REGULATORY MATTERS (Cost Recovery Mechanisms) (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Feb. 01, 2022	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2025	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Roll Forward]
Environmental compliance adjustor, as a percentage of total retail revenue					0.50%
Purchased Power and Fuel Adjustment Clause
Regulatory Liabilities [Roll Forward]
Beginning of Period					$ 23	$ 36
Deferred Fuel and Purchased Power Costs					343	283
PPFAC and Base Power Recoveries					(275)	(296)
End of Period					91	$ 23	$ 36
Tax Expense Adjustor Mechanism
Regulatory Liabilities [Roll Forward]
Customer Refunds					$ 29
Purchased Power and Fuel Adjustment Clause
Public Utilities, General Disclosures [Line Items]
Months approved rate in effect unless modified					12 months
Renewable Energy Standard
Regulatory Liabilities [Roll Forward]
Renewable energy target percentage					11.00%
Approved spending budget		$ 66
Renewable energy actual percentage					26.00%
Renewable Energy Standard | Forecast
Regulatory Liabilities [Roll Forward]
Renewable energy target percentage				15.00%
Distributed generation requirement percent of target percentage (percentage)				30.00%
Energy Efficiency Standards
Regulatory Liabilities [Roll Forward]
Percentage of cumulative annual retail kilowatt savings, actual					23.00%
Approved recovery of spending budget							$ 23
Requested recovery of spending budget			$ 23
Lost Fixed Cost Recovery
Regulatory Liabilities [Roll Forward]
Cap on increase in lost fixed cost recovery rate (percentage)					2.00%
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Period of recovery of uncollected true-up balance, scenario 1	18 months
Period of recovery of uncollected true-up balance, scenario 2	24 months