FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 757	$ 717
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,599	2,536
Total Unrealized Gains	1,971	1,852
Total Unrealized Losses	(102)	(97)
Total Fair Value	4,468	4,291
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37	52
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	37	52
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	378	381
Total Unrealized Gains	1,937	1,792
Total Unrealized Losses	(12)	(11)
Total Fair Value	2,303	2,162
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,184	2,103
Total Unrealized Gains	34	60
Total Unrealized Losses	(90)	(86)
Total Fair Value	2,128	2,077
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	494	216
Total Unrealized Gains	15	18
Total Unrealized Losses	(2)	(1)
Total Fair Value	507	233
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	351	49
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	351	49
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34	56
Total Unrealized Gains	14	16
Total Unrealized Losses	(1)	(1)
Total Fair Value	47	71
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	109	111
Total Unrealized Gains	1	2
Total Unrealized Losses	(1)	0
Total Fair Value	$ 109	$ 113