Basis of Presentation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 mi² shares retail_customers
Basis of Presentation [Abstract]
Service Area Sq Miles | mi²			4,000,000
Incorporated Cities			51
Number of Retail Customers | retail_customers			926,000
Service area population			1,900,000
Entity Number of Employees			2,873
Number of Union Employees			673
Number of Union Employees Subject to Agreement A			610
Number of Union Employees Subject to Agreement B			63
Debt extinguishment costs | $		$ 2
Contribution to pension and other postretirement plans | $	$ 2	$ 2