UNCONSOLIDATED AFFILIATES - Schedule of Equity in Net Earnings from Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 103	$ 92	$ 295	$ 281
Impairment of equity investments (Note I)	0	0	(60)	0
Northern Border
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	27	28	96	76
Overland Pass
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	22	22	70	68
Saddlehorn
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	13	13	35	39
Matterhorn
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	10	2	32	10
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	10	10	30	31
BridgeTex
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	12	9	28	31
Powder Springs
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	0	0	(26)	2
Other
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 9	$ 8	$ 30	$ 24