SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 5,898	$ 5,986	$ 11,881	$ 11,847
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,414	4,458	8,549	8,510
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,484	1,528	3,332	3,337
Utility
Disaggregation of Revenue [Abstract]
Total operating revenues	5,898	5,986	11,881	11,847	$ 11,847
Utility | Electric
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	4,589	4,876	8,658		8,919
Regulatory balancing accounts	(175)	(418)	(109)		(409)
Total operating revenues	4,414	4,458	8,549	8,510	8,510
Utility | Electric | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	1,421	1,516	3,255		3,315
Utility | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	1,613	1,655	3,119		3,160
Utility | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	386	441	800		854
Utility | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	478	439	677		619
Utility | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	26	27	53		52
Utility | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	665	798	754		919
Utility | Natural gas
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	961	686	3,495		2,987
Regulatory balancing accounts	523	842	(163)		350
Total operating revenues	1,484	1,528	3,332	$ 3,337	3,337
Utility | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	430	213	2,139		1,730
Utility | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	222	187	621		560
Utility | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	456	424	1,002		899
Utility | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	$ (147)	$ (138)	$ (267)		$ (202)