REVENUE - Narrative (Details) $ in Millions		12 Months Ended
		Dec. 31, 2023 USD ($) MW	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Utility customer payment period		30 days
Total revenues	[1]	$ 12,870	$ 12,459	$ 11,132
Accounts receivable, allowance for credit loss, period increase (decrease)		(77)
Deferred Regulatory Assets
Disaggregation of Revenue [Line Items]
Accounts receivable, allowance for credit loss, period increase (decrease)		$ (41)
Utilities and Transmission Companies
Disaggregation of Revenue [Line Items]
Plant generation capacity (in MW's) | MW		3,580

[1] Includes excise and gross receipts tax collections of $420 million, $406 million and $374 million in 2023, 2022 and 2021, respectively.