Investing Activities (Details) - USD ($) $ in Millions			12 Months Ended
		Nov. 30, 2023	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Equity-method investments			$ 4,614.0		$ 5,048.0
Other Investments and Securities, at Cost			23.0		17.0
Equity-method investment, payments to purchase or contributions			141.0		166.0	$ 115.0
Investments			4,637.0		5,065.0
Equity-method investment, difference between carrying amount and underlying equity			773.0		1,100.0
Investment Income, Interest			79.0		15.0	7.0
Investment Income Nonoperating Other			(1.0)		1.0	0.0
Other investing income (loss) - net			108.0		16.0	7.0
Distributions from equity-method investees (Note 8)			796.0		865.0	757.0
Current assets			4,513.0		3,797.0
Current liabilities			(5,830.0)		(4,890.0)
Revenues			10,907.0		10,965.0	10,627.0
Operating income			966.0		1,268.0	1,191.0
Net income			3,303.0		2,117.0	1,562.0
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Investments [Line Items]
Current assets			669.0		964.0
Noncurrent assets			11,058.0		12,701.0
Current liabilities			(358.0)		(632.0)
Noncurrent liabilities			(3,619.0)		(3,789.0)
Revenues			3,714.0		5,520.0	4,688.0
Net income			$ 748.0		1,102.0	1,006.0
Appalachia Midstream Investments [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			66.00%
Equity-method investments	[1]		$ 2,886.0		2,975.0
Equity-method investment, payments to purchase or contributions			59.0		83.0	84.0
Equity-method investment, difference between carrying amount and underlying equity			1,100.0		1,100.0
Distributions from equity-method investees (Note 8)			$ 405.0		415.0	433.0
Blue Racer Midstream LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			50.00%
Equity-method investments			$ 398.0		383.0
Distributions from equity-method investees (Note 8)			$ 62.0		49.0	47.0
Overland Pass Pipeline Company LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			50.00%
Equity-method investments			$ 387.0		386.0
Distributions from equity-method investees (Note 8)			$ 56.0		34.0	26.0
Discovery Producer Services LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			60.00%
Equity-method investments			$ 361.0		345.0
Equity-method investment, payments to purchase or contributions			40.0		41.0	0.0
Distributions from equity-method investees (Note 8)			$ 49.0		49.0	44.0
Gulfstream Natural Gas System, LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			50.00%
Equity-method investments			$ 210.0		220.0
Equity-method investment, payments to purchase or contributions			0.0		14.0	26.0
Distributions from equity-method investees (Note 8)			$ 98.0		89.0	90.0
Laurel Mountain Midstream, LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			69.00%
Equity-method investments			$ 184.0		205.0
Distributions from equity-method investees (Note 8)			$ 42.0		112.0	33.0
Rocky Mountain Midstream Holdings LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			100.00%
Equity-method investments			$ 0.0	[2]	395.0
Distributions from equity-method investees (Note 8)			49.0		52.0	45.0
Other [Member]
Schedule of Investments [Line Items]
Equity-method investments			188.0		139.0
Equity-method investment, payments to purchase or contributions			4.0		12.0	5.0
Distributions from equity-method investees (Note 8)			35.0		65.0	39.0
Aux Sable Liquid Products LP [Member]
Schedule of Investments [Line Items]
Equity-method investment, payments to purchase or contributions			38.0		0.0	0.0
Cardinal Pipeline Company, LLC
Schedule of Investments [Line Items]
Equity-method investment, payments to purchase or contributions			0.0		16.0	0.0
RMM Acquisition
Schedule of Investments [Line Items]
Gain on remeasurement of equity-method investment (Note 2)		$ 30.0	$ 30.0		$ 0.0	$ 0.0

[1] Includes equity-method investments in multiple gathering systems in the Marcellus Shale region with an approximate average 66 percent interest.

[2] RMM is a wholly owned subsidiary as of November 30, 2023. See Note 3 – Acquisitions and Divestitures.