Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) mi² retail_customers	Mar. 31, 2021 USD ($)
Basis of Presentation [Abstract]
Service Area Sq Miles | mi²	4
Incorporated Cities	51
Number of Retail Customers | retail_customers	921
increase (decrease) in cash flow from Deferral of incremental wildfire costs	$ (7)	$ (7)
Prior Period Reclassification Adjustment		$ 7