Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions	6 Months Ended
Jun. 30, 2023 USD ($) mi² retail_customers	Jun. 30, 2022 USD ($)
Basis of Presentation [Abstract]
Service Area Sq Miles \| mi²	4
Incorporated Cities	51
Number of Retail Customers \| retail_customers	928
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities \| $	$ (135)	$ 149

The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Name:	us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration