FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 654	$ 575
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,600	2,521
Total Unrealized Gains	1,698	1,478
Total Unrealized Losses	(120)	(127)
Total Fair Value	4,178	3,872
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	126	117
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	126	117
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	391	413
Total Unrealized Gains	1,684	1,468
Total Unrealized Losses	(11)	(11)
Total Fair Value	2,064	1,870
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,083	1,991
Total Unrealized Gains	14	10
Total Unrealized Losses	(109)	(116)
Total Fair Value	1,988	1,885
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	459	754
Total Unrealized Gains	23	13
Total Unrealized Losses	(6)	(22)
Total Fair Value	476	745
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7	19
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	7	19
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	129	219
Total Unrealized Gains	23	13
Total Unrealized Losses	(4)	(14)
Total Fair Value	148	218
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	323	516
Total Unrealized Gains	0	0
Total Unrealized Losses	(2)	(8)
Total Fair Value	$ 321	$ 508