Acquisitions (Details) - USD ($) $ in Millions				2 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended		12 Months Ended
	Nov. 01, 2024	Aug. 01, 2024	Jan. 03, 2024	Dec. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired								$ 1	$ 1,844
Revenues					$ 2,781	$ 2,336		5,829	5,107
Net income					546	401		1,237	1,033
Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue						2,377			5,194
Business Acquisition, Pro Forma Net Income (Loss)						403			1,038
Crowheart Acquisition
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage												75.00%
Business Combination, Consideration Transferred	$ 307
Crowheart Acquisition | Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue						17			38
Business Acquisition, Pro Forma Net Income (Loss)						3			9
Crowheart Acquisition | Minimum [Member]
Business Acquisition [Line Items]
Business Combination Step Acquisition Equity Interest In Acquiree After Acquisition Percentage	90.00%
Crowheart Acquisition | Other Operating Segment
Business Acquisition [Line Items]
Revenues				$ 20
Modified EBITDA Earnings Loss				$ 7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment					(56)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities					$ (56)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 94
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	15
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	345
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	456
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(45)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(59)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(104)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 352
Crowheart Acquisition | Other Operating Segment | Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination Acquisition Related Costs Cumulative								1
Discovery Acquisition
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 170
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value		381
Gain on remeasurement of equity-method investments		127
Discovery Acquisition | Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue						24			49
Business Acquisition, Pro Forma Net Income (Loss)						$ (1)			$ (4)
Discovery Acquisition | Transmission And Gulf Of America [Member]
Business Acquisition [Line Items]
Revenues							$ 144
Modified EBITDA Earnings Loss							$ 42
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		22
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		19
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		941
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		39
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		1,021
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		(40)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		(296)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		(336)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 685
Discovery Acquisition | Transmission And Gulf Of America [Member] | Discovery Producer Services LLC [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage												60.00%
Business Acquisition, Percentage of Voting Interests Acquired		40.00%
Discovery Acquisition | Transmission And Gulf Of America [Member] | Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination Acquisition Related Costs Cumulative											$ 1
Gulf Coast Storage Acquisition
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Combination, Consideration Transferred			$ 1,950
Business Combination, Consideration Transferred, Liabilities Incurred			100
Gulf Coast Storage Acquisition | Transmission And Gulf Of America [Member]
Business Acquisition [Line Items]
Revenues										$ 228
Modified EBITDA Earnings Loss										$ 160
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			46
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			18
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			2,035
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			2,101
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			(11)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other			(107)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			(118)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			$ 1,983
Gulf Coast Storage Acquisition | Transmission And Gulf Of America [Member] | Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination Acquisition Related Costs Cumulative								$ 15
Business Combination, Acquisition Related Costs											$ 14