FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 854	$ 881
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,023	2,975
Total Unrealized Gains	2,075	2,188
Total Unrealized Losses	(59)	(52)
Total Fair Value	5,039	5,111
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	53	94
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	53	94
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	323	324
Total Unrealized Gains	2,045	2,140
Total Unrealized Losses	(7)	(5)
Total Fair Value	2,361	2,459
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,647	2,557
Total Unrealized Gains	30	48
Total Unrealized Losses	(52)	(47)
Total Fair Value	2,625	2,558
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	693	800
Total Unrealized Gains	1	5
Total Unrealized Losses	(3)	(1)
Total Fair Value	691	804
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	127	111
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	127	111
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	0
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	0	0
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	566	689
Total Unrealized Gains	1	5
Total Unrealized Losses	(3)	(1)
Total Fair Value	$ 564	$ 693