FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 860	$ 747
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,911	2,748
Total Unrealized Gains	2,194	1,927
Total Unrealized Losses	(55)	(95)
Total Fair Value	5,050	4,580
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34	54
Total Unrealized Gains	0	0
Total Unrealized Losses	0	(1)
Total Fair Value	34	53
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	382	353
Total Unrealized Gains	2,142	1,907
Total Unrealized Losses	(6)	(10)
Total Fair Value	2,518	2,250
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,495	2,341
Total Unrealized Gains	52	20
Total Unrealized Losses	(49)	(84)
Total Fair Value	2,498	2,277
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	792	355
Total Unrealized Gains	114	29
Total Unrealized Losses	(4)	(7)
Total Fair Value	902	377
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8	1
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	8	1
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	344	161
Total Unrealized Gains	109	28
Total Unrealized Losses	(3)	(3)
Total Fair Value	450	186
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	440	193
Total Unrealized Gains	5	1
Total Unrealized Losses	(1)	(4)
Total Fair Value	$ 444	$ 190