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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 3,316 | $ 1,678 | $ 1,518
Impairment loss | 6 |  |
Nuclear decommissioning trusts |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 3,316 | 1,678 | 1,518
Gross realized gains on securities | 2 | 286 | 159
Gross realized losses on securities | (3) | $ (19) | $ (41)
Customer credit trust |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 250 |  |
Gross realized gains on securities | 10 |  |
Gross realized losses on securities | $ (41) |  |

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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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