FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 747	$ 717
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,748	2,536
Total Unrealized Gains	1,927	1,852
Total Unrealized Losses	(95)	(97)
Total Fair Value	4,580	4,291
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	54	52
Total Unrealized Gains	0	0
Total Unrealized Losses	(1)	0
Total Fair Value	53	52
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	353	381
Total Unrealized Gains	1,907	1,792
Total Unrealized Losses	(10)	(11)
Total Fair Value	2,250	2,162
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,341	2,103
Total Unrealized Gains	20	60
Total Unrealized Losses	(84)	(86)
Total Fair Value	2,277	2,077
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	355	216
Total Unrealized Gains	29	18
Total Unrealized Losses	(7)	(1)
Total Fair Value	377	233
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1	49
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	1	49
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	161	56
Total Unrealized Gains	28	16
Total Unrealized Losses	(3)	(1)
Total Fair Value	186	71
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	193	111
Total Unrealized Gains	1	2
Total Unrealized Losses	(4)	0
Total Fair Value	$ 190	$ 113