FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 631	$ 575
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,636	2,521
Total Unrealized Gains	1,586	1,478
Total Unrealized Losses	(181)	(127)
Total Fair Value	4,041	3,872
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	125	117
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	125	117
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	377	413
Total Unrealized Gains	1,584	1,468
Total Unrealized Losses	(12)	(11)
Total Fair Value	1,949	1,870
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,134	1,991
Total Unrealized Gains	2	10
Total Unrealized Losses	(169)	(116)
Total Fair Value	1,967	1,885
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313	754
Total Unrealized Gains	13	13
Total Unrealized Losses	(7)	(22)
Total Fair Value	319	745
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	108	19
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	108	19
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	82	219
Total Unrealized Gains	13	13
Total Unrealized Losses	(3)	(14)
Total Fair Value	92	218
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	123	516
Total Unrealized Gains	0	0
Total Unrealized Losses	(4)	(8)
Total Fair Value	$ 119	$ 508