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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 277 | $ 421
Nuclear decommissioning trusts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 277 | 421
Gross realized gains on securities | 5 | 56
Gross realized losses on securities | (8) | (7)
Customer credit trust |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 169 | 0
Gross realized gains on securities | 2 | 0
Gross realized losses on securities | $ (5) | $ 0

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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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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