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UNCONSOLIDATED AFFILIATES - Equity in Net Earnings from Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 76	$ 40
Northern Border
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	25	24
Overland Pass
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	15	9
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	11	7
Saddlehorn
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	10	0
BridgeTex
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	7	0
MVP
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	4	0
Other
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 4	$ 0

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- Definition

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

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