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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 |

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