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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

X

- Definition

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

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