REVENUE - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 3,231	$ 2,989
Incremental decrease to uncollectible expense due to Covid-19		14	25
Deferred Regulatory Assets
Disaggregation of Revenue [Line Items]
Incremental decrease to uncollectible expense due to Covid-19		6	15
Other Non-Customer Revenue | Derivative revenue
Disaggregation of Revenue [Line Items]
Late payment charges		11	10
Revenues		$ 6	$ 9

[1] Includes excise and gross receipts tax collections of $109 million and $103 million during the three months ended March 31, 2023 and 2022, respectively.