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FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Nuclear decommissioning trusts |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total maturities of fixed-income securities | $ 4,178 | $ 3,872
Nuclear decommissioning trusts | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 1 year | 22 |
1–5 years | 627 |
5–10 years | 497 |
More than 10 years | 842 |
Total maturities of fixed-income securities | 1,988 | 1,885
Customer credit trust |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total maturities of fixed-income securities | 476 | 745
Customer credit trust | Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 1 year | 0 |
1–5 years | 88 |
5–10 years | 80 |
More than 10 years | 153 |
Total maturities of fixed-income securities | $ 321 | $ 508

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