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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | $ (69) | $ 201 | $ 121
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | 21 | 87 | (261)
Commodity Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (50) | 147 | (85)
Commodity Contract | 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 | 60 | 201 | (484)
Commodity Contract | 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 | (19) | (93) | 257
Interest Rate Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | (19) | 54 | 206
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 | $ (20) | $ (21) | $ (34)

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