FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 559	$ 783
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,512	2,439
Total Unrealized Gains	1,463	2,164
Total Unrealized Losses	(125)	(22)
Total Fair Value	3,850	4,581
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60	22
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	60	22
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	423	479
Total Unrealized Gains	1,443	2,066
Total Unrealized Losses	(15)	(10)
Total Fair Value	1,851	2,535
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,029	1,938
Total Unrealized Gains	20	98
Total Unrealized Losses	(110)	(12)
Total Fair Value	1,939	$ 2,024
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	485
Total Unrealized Gains	1
Total Unrealized Losses	(8)
Total Fair Value	478
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	98
Total Unrealized Gains	0
Total Unrealized Losses	0
Total Fair Value	98
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	139
Total Unrealized Gains	0
Total Unrealized Losses	(7)
Total Fair Value	132
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	248
Total Unrealized Gains	1
Total Unrealized Losses	(1)
Total Fair Value	$ 248