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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments |  |  | $ 2,135 | $ 1,176
Impairment loss | $ 7 |  | 7 |
Nuclear decommissioning trusts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 766 | $ 224 | 2,135 | 1,176
Gross realized gains on securities | 21 | 21 | 158 | 150
Gross realized losses on securities | (40) | $ (2) | $ (105) | (18)
Customer credit trust |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 79 |  |  | 79
Gross realized gains on securities | 8 |  |  | 8
Gross realized losses on securities | $ (18) |  |  | $ (18)

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- Definition The cash inflow from the sale of assets held in a decommissioning trust fund. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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