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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Cash Flow Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedge, cumulative gain (loss) | $ 31 | $ (58) |
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 201 | 121 | $ (265)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives | 87 | (261) | (298)
Commodity Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedge, cumulative gain (loss) | 63 |  |
Gain (loss) on cash flow hedge to be reclassified within 12 months | 63 |  |
Commodity Contract | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 147 | (85) | (323)
Commodity Contract | Commodity sales revenues | Cash Flow Hedging |  |  |
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 | 201 | (484) | (732)
Commodity Contract | Cost of sales and fuel | Cash Flow Hedging |  |  |
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 | (93) | 257 | 474
Interest-Rate Swaps and Treasury Locks |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedge, cumulative gain (loss) | (32) |  |
Gain (loss) on cash flow hedge to be reclassified within 12 months | (15) |  |
Interest Rate Contracts | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss) | 54 | 206 | 58
Interest Rate Contracts | Interest expense | Cash Flow Hedging |  |  |
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 | $ (21) | $ (34) | $ (40)

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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 + Details
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