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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income | $ 15 | $ 138 | $ 111 | $ 74
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | 11 | (70) | 58 | (247)
Commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income | (37) | 69 | 57 | (139)
Commodity contracts | Commodity sales revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | 31 | (78) | 149 | (546)
Commodity contracts | Cost of sales and fuel |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | (15) | 18 | (75) | 328
Interest-rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income | 52 | 69 | 54 | 213
Interest-rate contracts | Interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | $ (5) | $ (10) | $ (16) | $ (29)

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