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FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amount primarily related to deferred taxes on appreciation of investment value | $ 717 | $ 575
Nuclear decommissioning trusts |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,536 | 2,521
Total Unrealized Gains | 1,852 | 1,478
Total Unrealized Losses | (97) | (127)
Total Fair Value | 4,291 | 3,872
Nuclear decommissioning trusts | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 52 | 117
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 52 | 117
Nuclear decommissioning trusts | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 381 | 413
Total Unrealized Gains | 1,792 | 1,468
Total Unrealized Losses | (11) | (11)
Total Fair Value | 2,162 | 1,870
Nuclear decommissioning trusts | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,103 | 1,991
Total Unrealized Gains | 60 | 10
Total Unrealized Losses | (86) | (116)
Total Fair Value | 2,077 | 1,885
Customer credit trust |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 216 | 754
Total Unrealized Gains | 18 | 13
Total Unrealized Losses | (1) | (22)
Total Fair Value | 233 | 745
Customer credit trust | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49 | 19
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 49 | 19
Customer credit trust | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 56 | 219
Total Unrealized Gains | 16 | 13
Total Unrealized Losses | (1) | (14)
Total Fair Value | 71 | 218
Customer credit trust | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 111 | 516
Total Unrealized Gains | 2 | 0
Total Unrealized Losses | 0 | (8)
Total Fair Value | $ 113 | $ 508

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