Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($) mi² retail_customers	Mar. 31, 2022 USD ($)
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 \| $	$ (140)	$ 99

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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