Contingencies and Commitments (Details) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		$ 42
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Other current liabilities
Other current liabilities		$ 1,360	$ 1,284
Transcontinental Gas Pipe Line Company, LLC [Member]
Loss Contingencies [Line Items]
Regulatory Assets, Current		74	87
Other current liabilities		181	190
Interest Income, Other		58	87	$ 36
Transcontinental Gas Pipe Line Company, LLC [Member] | Environmental Restoration Costs
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		$ 11
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Other current liabilities, Other Liabilities, Noncurrent
Transcontinental Gas Pipe Line Company, LLC [Member] | Potentially Responsible Party At Various Superfund And State Waste Disposal Sites | Maximum [Member]
Loss Contingencies [Line Items]
Site Contingency, Loss Exposure Not Accrued, Best Estimate		$ 1
Northwest Pipeline LLC [Member]
Loss Contingencies [Line Items]
Regulatory Assets, Current		6	2
Other current liabilities		34	34
Interest Income, Other		2	1
Northwest Pipeline LLC [Member] | Environmental Restoration Costs
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		$ 1
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Other current liabilities, Other Liabilities, Noncurrent
Northwest Pipeline LLC [Member] | Washington State Climate Commitment Act
Loss Contingencies [Line Items]
Regulatory Assets, Current		$ 38	22
Other current liabilities		3	$ 4
Capital Addition Purchase Commitments [Member]
Loss Contingencies [Line Items]
Commitments for construction and acquisition of property, plant, and equipment		155
Capital Addition Purchase Commitments [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Loss Contingencies [Line Items]
Commitments for construction and acquisition of property, plant, and equipment		2
Capital Addition Purchase Commitments [Member] | Northwest Pipeline LLC [Member]
Loss Contingencies [Line Items]
Commitments for construction and acquisition of property, plant, and equipment		1
Gas & NGL Marketing Services
Loss Contingencies [Line Items]
Other Commitment		954
Gas Pipeline [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		12
Recoverable through rates [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		4
Natural Gas Underground Storage Facilities [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		7
Former Operations [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities		$ 23
Construction Project | Transcontinental Gas Pipe Line Company, LLC [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	$ 110
Loss Contingency Expected Recovery Percentage	0.29