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UNCONSOLIDATED AFFILIATES - Equity in Net Earnings from Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 88	$ 43	$ 164	$ 83
Northern Border
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	22	14	47	38
Overland Pass
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	23	13	38	22
Saddlehorn
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	13	0	23	0
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	10	15	21	22
BridgeTex
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	11	0	18	0
MVP
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	3	0	7	0
Other
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 6	$ 1	$ 10	$ 1

X

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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