SEGMENT AND RELATED INFORMATION - Electric Utilities' Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Total operating revenues	$ 25,253	$ 29,279	$ 23,113
Wholesale electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	2,467	3,641	2,455
Electric Utilities
Revenue from External Customer [Line Items]
Total operating revenues	19,998	22,873	18,300
Electric Utilities | Retail electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	16,343	18,197	14,852
Electric Utilities | Wholesale electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	2,467	3,641	2,455
Electric Utilities | Other
Revenue from External Customer [Line Items]
Total operating revenues	$ 1,188	$ 1,035	$ 993