REGULATORY MATTERS (Regulatory Assets and Liabilities - Footnotes) (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($)
Final Mine Reclamation
Regulatory Assets [Line Items]
Increase in regulatory asset	$ 15
Income Taxes Recoverable (Payable) through Future Rates \| Minimum
Regulatory Assets [Line Items]
Amortization period	5 years
Income Taxes Recoverable (Payable) through Future Rates \| Maximum
Regulatory Assets [Line Items]
Amortization period	10 years

The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Name:	us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration