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Acquisitions (Details) - USD ($) $ in Millions					2 Months Ended	3 Months Ended			5 Months Ended	9 Months Ended		12 Months Ended
		Nov. 01, 2024	Aug. 01, 2024	Jan. 03, 2024	Dec. 31, 2024	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Business Combination [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired										$ 1	$ 1,995
Revenues						$ 2,923		$ 2,653		8,752	7,760
Gain on remeasurement of equity-method investments										0	127
Net income						$ 647		706		1,884	1,739
Pro Forma [Member]
Business Combination [Line Items]
Business Combination, Pro Forma Information, Pro Forma Revenue								2,678			7,872
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax								707			1,745
Crowheart Acquisition
Business Combination [Line Items]
Business Combination, Consideration Transferred		$ 307
Business Combination Achieved In Stages Preacquisition Working Interest In Acquiree Percentage														75.00%
Crowheart Acquisition | Pro Forma [Member]
Business Combination [Line Items]
Business Combination, Pro Forma Information, Pro Forma Revenue								16			54
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax								2			11
Crowheart Acquisition | Minimum [Member]
Business Combination [Line Items]
Business Combination Step Acquisition Working Interest In Acquiree After Acquisition Percentage		90.00%
Crowheart Acquisition | Other Operating Segment
Business Combination [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 Asset Acquired, Cash and Cash Equivalent		$ 94
Business Combination, Recognized Asset Acquired, Other Asset, Current		15
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment		345
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent		2
Business Combination, Recognized Asset Acquired, Asset		456
Business Combination, Recognized Liability Assumed, Other Liability, Current		(45)
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent		(59)
Business Combination, Recognized Liability Assumed, Liability		(104)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)		$ 352
Crowheart Acquisition | Other Operating Segment | Selling, general and administrative expenses [Member]
Business Combination [Line Items]
Business Combination Acquisition Related Costs Cumulative										1
Discovery Acquisition
Business Combination [Line Items]
Business Combination, Consideration Transferred			$ 170
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value			381
Gain on remeasurement of equity-method investments			$ 127
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]			Other investing income (loss) - net
Discovery Acquisition | Pro Forma [Member]
Business Combination [Line Items]
Business Combination, Pro Forma Information, Pro Forma Revenue	[1]							9			58
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax	[1]							$ (1)			$ (5)
Discovery Acquisition | Transmission, Power & Gulf [Member]
Business Combination [Line Items]
Revenues									$ 144
Modified EBITDA Earnings Loss									$ 42
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent			$ 22
Business Combination, Recognized Asset Acquired, Other Asset, Current			19
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment			941
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent			39
Business Combination, Recognized Asset Acquired, Asset			1,021
Business Combination, Recognized Liability Assumed, Other Liability, Current			(40)
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent			(296)
Business Combination, Recognized Liability Assumed, Liability			(336)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)			$ 685
Discovery Acquisition | Transmission, Power & Gulf [Member] | Discovery Producer Services LLC [Member]
Business Combination [Line Items]
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Percentage														60.00%
Business Combination, Voting Equity Interest Acquired, Percentage			40.00%
Discovery Acquisition | Transmission, Power & Gulf [Member] | Selling, general and administrative expenses [Member]
Business Combination [Line Items]
Business Combination Acquisition Related Costs Cumulative												$ 1
Gulf Coast Storage Acquisition
Business Combination [Line Items]
Business Combination, Voting Equity Interest Acquired, Percentage				100.00%
Business Combination, Consideration Transferred				$ 1,950
Business Combination, Consideration Transferred, Liabilities Incurred				100
Gulf Coast Storage Acquisition | Transmission, Power & Gulf [Member]
Business Combination [Line Items]
Revenues													$ 228
Modified EBITDA Earnings Loss													$ 160
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent				46
Business Combination, Recognized Asset Acquired, Other Asset, Current				18
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment				2,035
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent				2
Business Combination, Recognized Asset Acquired, Asset				2,101
Business Combination, Recognized Liability Assumed, Other Liability, Current				(11)
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent				(107)
Business Combination, Recognized Liability Assumed, Liability				(118)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)				$ 1,983
Gulf Coast Storage Acquisition | Transmission, Power & Gulf [Member] | Selling, general and administrative expenses [Member]
Business Combination [Line Items]
Business Combination Acquisition Related Costs Cumulative										$ 15
Business Combination, Acquisition-Related Cost, Expense												$ 14
[1] Excludes results from operations acquired in the acquisition for the period beginning on the acquisition date, as these results are included in the amounts as reported.

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