FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 744	$ 747
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,774	2,748
Total Unrealized Gains	1,894	1,927
Total Unrealized Losses	(70)	(95)
Total Fair Value	4,598	4,580
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60	54
Total Unrealized Gains	0	0
Total Unrealized Losses	0	(1)
Total Fair Value	60	53
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	360	353
Total Unrealized Gains	1,853	1,907
Total Unrealized Losses	(8)	(10)
Total Fair Value	2,205	2,250
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,354	2,341
Total Unrealized Gains	41	20
Total Unrealized Losses	(62)	(84)
Total Fair Value	2,333	2,277
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	927	355
Total Unrealized Gains	26	29
Total Unrealized Losses	(4)	(7)
Total Fair Value	949	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	442	161
Total Unrealized Gains	25	28
Total Unrealized Losses	(2)	(3)
Total Fair Value	465	186
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	469	193
Total Unrealized Gains	1	1
Total Unrealized Losses	(2)	(4)
Total Fair Value	$ 468	$ 190