SEGMENT AND RELATED INFORMATION - Electric Utilities' Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Total operating revenues	$ 29,279	$ 23,113	$ 20,375
Wholesale electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	3,641	2,455	1,945
Electric Utilities
Revenue from External Customer [Line Items]
Total operating revenues	22,873	18,300	16,497
Electric Utilities | Retail electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	18,197	14,852	13,643
Electric Utilities | Wholesale electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	3,641	2,455	1,945
Electric Utilities | Other
Revenue from External Customer [Line Items]
Total operating revenues	$ 1,035	$ 993	$ 909