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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ 30 | $ (93)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | 15 | (86)
Commodity Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 40 | (174)
Commodity Contracts | Commodity sales revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | 23 | (211)
Commodity Contracts | Cost of sales and fuel |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | (3) | 134
Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (10) | 81
Interest Rate Contracts | Interest expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | $ (5) | $ (9)

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