FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 530	$ 783
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,544	2,439
Total Unrealized Gains	1,322	2,164
Total Unrealized Losses	(187)	(22)
Total Fair Value	3,679	4,581
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	103	22
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	103	22
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	427	479
Total Unrealized Gains	1,314	2,066
Total Unrealized Losses	(28)	(10)
Total Fair Value	1,713	2,535
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,014	1,938
Total Unrealized Gains	8	98
Total Unrealized Losses	(159)	(12)
Total Fair Value	1,863	$ 2,024
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	930
Total Unrealized Gains	2
Total Unrealized Losses	(58)
Total Fair Value	874
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7
Total Unrealized Gains	0
Total Unrealized Losses	0
Total Fair Value	7
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	284
Total Unrealized Gains	2
Total Unrealized Losses	(35)
Total Fair Value	251
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	639
Total Unrealized Gains	0
Total Unrealized Losses	(23)
Total Fair Value	$ 616