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FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains Losses Related to Available-for-sale Investments) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amount primarily related to deferred taxes on appreciation of investment value | $ 559 | $ 783
Nuclear decommissioning trusts |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,512 | 2,439
Total Unrealized Gains | 1,463 | 2,164
Total Unrealized Losses | (125) | (22)
Total Fair Value | 3,850 | 4,581
Nuclear decommissioning trusts | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 60 | 22
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 60 | 22
Nuclear decommissioning trusts | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 423 | 479
Total Unrealized Gains | 1,443 | 2,066
Total Unrealized Losses | (15) | (10)
Total Fair Value | 1,851 | 2,535
Nuclear decommissioning trusts | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,029 | 1,938
Total Unrealized Gains | 20 | 98
Total Unrealized Losses | (110) | (12)
Total Fair Value | 1,939 | $ 2,024
Customer credit trust |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 485 |
Total Unrealized Gains | 1 |
Total Unrealized Losses | (8) |
Total Fair Value | 478 |
Customer credit trust | Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98 |
Total Unrealized Gains | 0 |
Total Unrealized Losses | 0 |
Total Fair Value | 98 |
Customer credit trust | Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 139 |
Total Unrealized Gains | 0 |
Total Unrealized Losses | (7) |
Total Fair Value | 132 |
Customer credit trust | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 248 |
Total Unrealized Gains | 1 |
Total Unrealized Losses | (1) |
Total Fair Value | $ 248 |

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