FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amount primarily related to deferred taxes on appreciation of investment value	$ 822	$ 717
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,704	2,536
Total Unrealized Gains	2,088	1,852
Total Unrealized Losses	(58)	(97)
Total Fair Value	4,734	4,291
Nuclear decommissioning trusts | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42	52
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	42	52
Nuclear decommissioning trusts | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	367	381
Total Unrealized Gains	2,009	1,792
Total Unrealized Losses	(7)	(11)
Total Fair Value	2,369	2,162
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,295	2,103
Total Unrealized Gains	79	60
Total Unrealized Losses	(51)	(86)
Total Fair Value	2,323	2,077
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	421	216
Total Unrealized Gains	26	18
Total Unrealized Losses	(1)	(1)
Total Fair Value	446	233
Customer credit trust | Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5	49
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Total Fair Value	5	49
Customer credit trust | Global equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	200	56
Total Unrealized Gains	23	16
Total Unrealized Losses	0	(1)
Total Fair Value	223	71
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	216	111
Total Unrealized Gains	3	2
Total Unrealized Losses	(1)	0
Total Fair Value	$ 218	$ 113