Contingent Liabilities (Details) - USD ($) $ in Millions				1 Months Ended
	Sep. 21, 2022	Dec. 29, 2021	May 20, 2016	Jan. 31, 2020	Mar. 31, 2023
Loss Contingencies [Line Items]
Accrued environmental loss liabilities					$ 40
Former Alaska Refinery [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value				$ 86
Energy Transfer Merger [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 1,480
Litigation Settlement, Amount Awarded from Other Party	$ 602	$ 410
Gas Pipeline [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities					13
Recoverable through rates
Loss Contingencies [Line Items]
Accrued environmental loss liabilities					4
Natural Gas Under Ground Storage Facilities [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities					10
Former Operations [Member]
Loss Contingencies [Line Items]
Accrued environmental loss liabilities					$ 17