FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 627	$ 575
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,544	2,521
Total Unrealized Gains	1,618	1,478
Total Unrealized Losses	(97)	(127)
Total Fair Value	4,065	3,872
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	131	117
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	131	117
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	407	413
Total Unrealized Gains	1,589	1,468
Total Unrealized Losses	(9)	(11)
Total Fair Value	1,987	1,870
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,006	1,991
Total Unrealized Gains	29	10
Total Unrealized Losses	(88)	(116)
Total Fair Value	1,947	1,885
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	588	754
Total Unrealized Gains	23	13
Total Unrealized Losses	(9)	(22)
Total Fair Value	602	745
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8	19
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	8	19
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	170	219
Total Unrealized Gains	20	13
Total Unrealized Losses	(5)	(14)
Total Fair Value	185	218
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	410	516
Total Unrealized Gains	3	0
Total Unrealized Losses	(4)	(8)
Total Fair Value	$ 409	$ 508