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FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amount primarily related to deferred taxes on appreciation of investment value | $ 860 | $ 747
Nuclear decommissioning trusts |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,911 | 2,748
Total Unrealized Gains | 2,194 | 1,927
Total Unrealized Losses | (55) | (95)
Total Fair Value | 5,050 | 4,580
Nuclear decommissioning trusts | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34 | 54
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | (1)
Total Fair Value | 34 | 53
Nuclear decommissioning trusts | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 382 | 353
Total Unrealized Gains | 2,142 | 1,907
Total Unrealized Losses | (6) | (10)
Total Fair Value | 2,518 | 2,250
Nuclear decommissioning trusts | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,495 | 2,341
Total Unrealized Gains | 52 | 20
Total Unrealized Losses | (49) | (84)
Total Fair Value | 2,498 | 2,277
Customer credit trust |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 792 | 355
Total Unrealized Gains | 114 | 29
Total Unrealized Losses | (4) | (7)
Total Fair Value | 902 | 377
Customer credit trust | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8 | 1
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 8 | 1
Customer credit trust | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 344 | 161
Total Unrealized Gains | 109 | 28
Total Unrealized Losses | (3) | (3)
Total Fair Value | 450 | 186
Customer credit trust | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 440 | 193
Total Unrealized Gains | 5 | 1
Total Unrealized Losses | (1) | (4)
Total Fair Value | $ 444 | $ 190

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