Contingencies (Details) $ in Millions	Sep. 30, 2024 USD ($)
Loss Contingencies [Line Items]
Accrued environmental loss liabilities	$ 44
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current
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	$ 25