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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 25, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities | $ 12 |  | $ 107 | $ 86 | $ 57 |
Senior Notes | Magellan Acquisition |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 5,250
Treasury Lock |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities | 43 |  |  |  |  |
Treasury Lock | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative notional amount, new contracts |  | $ 1,100 |  |  |  |
Derivative, notional amount settled | 1,100 |  |  |  |  |
Forward contracts |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities | 44 |  |  |  |  |
Interest-rate contracts | Forward contracts | Cash Flow Hedging |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount settled | $ 400 |  |  |  |  |

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