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FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amount primarily related to deferred taxes on appreciation of investment value | $ 627 | $ 575
Nuclear decommissioning trusts |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,544 | 2,521
Total Unrealized Gains | 1,618 | 1,478
Total Unrealized Losses | (97) | (127)
Total Fair Value | 4,065 | 3,872
Nuclear decommissioning trusts | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 131 | 117
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 131 | 117
Nuclear decommissioning trusts | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 407 | 413
Total Unrealized Gains | 1,589 | 1,468
Total Unrealized Losses | (9) | (11)
Total Fair Value | 1,987 | 1,870
Nuclear decommissioning trusts | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,006 | 1,991
Total Unrealized Gains | 29 | 10
Total Unrealized Losses | (88) | (116)
Total Fair Value | 1,947 | 1,885
Customer credit trust |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 588 | 754
Total Unrealized Gains | 23 | 13
Total Unrealized Losses | (9) | (22)
Total Fair Value | 602 | 745
Customer credit trust | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8 | 19
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 8 | 19
Customer credit trust | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 170 | 219
Total Unrealized Gains | 20 | 13
Total Unrealized Losses | (5) | (14)
Total Fair Value | 185 | 218
Customer credit trust | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 410 | 516
Total Unrealized Gains | 3 | 0
Total Unrealized Losses | (4) | (8)
Total Fair Value | $ 409 | $ 508

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