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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 25, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Cash flow hedge, cumulative gain (loss) |  |  | $ 31,000,000 | $ (58,000,000) |  |
Change in fair value of derivatives, net of tax of $(46), $(28) and $61, respectively |  |  | 155,000,000 | 93,000,000 | $ (204,000,000) |
Gain (loss) on AOCI, cash flow hedges |  |  | 66,000,000 | $ (201,000,000) | $ (229,000,000) |
Derivative, net liability position, aggregate fair value |  |  | 0 |  |  |
Senior Notes | Magellan Acquisition |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 5,250,000,000
Commodity Contract |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Cash flow hedge, cumulative gain (loss) |  |  | 63,000,000 |  |  |
Treasury Lock |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Change in fair value of derivatives, net of tax of $(46), $(28) and $61, respectively | $ 43,000,000 |  |  |  |  |
Treasury Lock | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount settled | $ 1,100,000,000 |  |  |  |  |
Forward contracts |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Change in fair value of derivatives, net of tax of $(46), $(28) and $61, respectively |  |  | 44,000,000 |  |  |
Forward contracts | Interest-rate contracts | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount settled |  |  | $ 400,000,000 |  |  |
Forward contracts | Treasury Lock | Cash Flow Hedging | Forecasted Debt Issuances |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative notional amount, new contracts |  | $ 1,100,000,000 |  |  |  |

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