FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 717	$ 575
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,536	2,521
Total Unrealized Gains	1,852	1,478
Total Unrealized Losses	(97)	(127)
Total Fair Value	4,291	3,872
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52	117
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	52	117
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	381	413
Total Unrealized Gains	1,792	1,468
Total Unrealized Losses	(11)	(11)
Total Fair Value	2,162	1,870
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,103	1,991
Total Unrealized Gains	60	10
Total Unrealized Losses	(86)	(116)
Total Fair Value	2,077	1,885
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	216	754
Total Unrealized Gains	18	13
Total Unrealized Losses	(1)	(22)
Total Fair Value	233	745
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49	19
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	49	19
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56	219
Total Unrealized Gains	16	13
Total Unrealized Losses	(1)	(14)
Total Fair Value	71	218
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	111	516
Total Unrealized Gains	2	0
Total Unrealized Losses	0	(8)
Total Fair Value	$ 113	$ 508