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UNCONSOLIDATED AFFILIATES - Schedule of Equity in Net Earnings from Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 92	$ 92	$ 281	$ 256
Northern Border
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	28	25	76	72
Overland Pass
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	22	23	68	61
Saddlehorn
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	13	13	39	36
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	10	9	31	30
BridgeTex
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	9	7	31	25
Other
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 10	$ 15	$ 36	$ 32

X

- Definition

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

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