FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 809	$ 747
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,759	2,748
Total Unrealized Gains	2,135	1,927
Total Unrealized Losses	(63)	(95)
Total Fair Value	4,831	4,580
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46	54
Total Unrealized Gains	0	0
Total Unrealized Losses	0	(1)
Total Fair Value	46	53
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	372	353
Total Unrealized Gains	2,091	1,907
Total Unrealized Losses	(6)	(10)
Total Fair Value	2,457	2,250
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,341	2,341
Total Unrealized Gains	44	20
Total Unrealized Losses	(57)	(84)
Total Fair Value	2,328	2,277
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	857	355
Total Unrealized Gains	84	29
Total Unrealized Losses	(6)	(7)
Total Fair Value	935	377
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16	1
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	16	1
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	397	161
Total Unrealized Gains	80	28
Total Unrealized Losses	(4)	(3)
Total Fair Value	473	186
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	444	193
Total Unrealized Gains	4	1
Total Unrealized Losses	(2)	(4)
Total Fair Value	$ 446	$ 190