SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Abstract]
Total operating revenues	$ 6,250	$ 5,941	$ 18,131	$ 17,788
Electric
Disaggregation of Revenue [Abstract]
Total operating revenues	4,755	4,538	13,304	13,048
Natural gas
Disaggregation of Revenue [Abstract]
Total operating revenues	1,495	1,403	4,827	4,740
Utility
Disaggregation of Revenue [Abstract]
Total operating revenues	6,250	5,941	18,131	17,788	$ 17,788
Utility | Electric
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	5,848	5,851	14,506		14,770
Regulatory balancing accounts	(1,093)	(1,313)	(1,202)		(1,722)
Total operating revenues	4,755	4,538	13,304	13,048	13,048
Utility | Electric | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	2,306	2,572	5,561		5,887
Utility | Electric | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	2,249	2,301	5,368		5,461
Utility | Electric | Industrial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	655	707	1,455		1,561
Utility | Electric | Agricultural
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	807	802	1,484		1,421
Utility | Electric | Public street and highway lighting
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	27	26	80		78
Utility | Electric | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	(196)	(557)	558		362
Utility | Natural gas
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	1,098	1,027	4,593		4,014
Regulatory balancing accounts	397	376	234		726
Total operating revenues	1,495	1,403	4,827	$ 4,740	4,740
Utility | Natural gas | Residential
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	490	412	2,629		2,142
Utility | Natural gas | Commercial
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	173	163	794		723
Utility | Natural gas | Transportation service only
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	436	408	1,438		1,307
Utility | Natural gas | Other, net
Disaggregation of Revenue [Abstract]
Total revenue from contracts with customers	$ (1)	$ 44	$ (268)		$ (158)