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UNCONSOLIDATED AFFILIATES - Equity in Net Earnings from Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in net earnings from investments | $ 49 | $ 39 | $ 132 | $ 111
Northern Border |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in net earnings from investments | 20 | 17 | 58 | 53
Overland Pass |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in net earnings from investments | 17 | 10 | 39 | 23
Roadrunner |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in net earnings from investments | 10 | 10 | 32 | 28
Other |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in net earnings from investments | $ 2 | $ 2 | $ 3 | $ 7

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