REVENUE - Narrative (Details)		3 Months Ended	12 Months Ended
		Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) company MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Utility customer payment period			30 days
Total revenues	[1]		$ 12,459,000,000	$ 11,132,000,000	$ 10,790,000,000
Concentration of risk of accounts receivable			$ 0	$ 0
Accounts receivable, allowance for credit loss, period increase (Decrease)		$ 25,000,000			$ (121,000,000)
LateFeeIncomeServicingFinancialAssetStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag			late payment charges	late payment charges	late payment charges
Deferred Regulatory Assets
Disaggregation of Revenue [Line Items]
Accounts receivable, allowance for credit loss, period increase (Decrease)		$ 15,000,000
Other Non-Customer Revenue | Derivative Revenue
Disaggregation of Revenue [Line Items]
Total revenues			$ 15,000,000	$ 11,000,000	$ 14,000,000
Other Non-Customer Revenue | Other revenue unrelated to contracts with customers
Disaggregation of Revenue [Line Items]
Late payment charges			$ 38,000,000	$ 36,000,000	$ 31,000,000
Utilities and Transmission Companies
Disaggregation of Revenue [Line Items]
Number of existing utility operating companies | company			10
Plant generation capacity (in MW's) | MW			3,580

[1] Includes excise and gross receipts tax collections of $406 million, $374 million and $362 million in 2022, 2021 and 2020, respectively.