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Basis of Presentation (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2021
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   917,000
Service area population   1,900,000
Entity Number of Employees   2,839
Number of Union Employees   678
Number of Union Employees Subject to Agreement A   614
Number of Union Employees Subject to Agreement B   64
UtilityOperatingExpenseOtherReclasedFromOtherNonCashIncomeAndExpenseforWildfireCosts | $ $ 1  
UtilityOperatingExpenseOtherReclassedFromOtherNetForWildfileCosts | $ $ 14