Commitments and Contingencies (Details) - Enviromental $ in Millions	Dec. 31, 2022 USD ($)
Federal Clean Water Act Section 316 (b) \| Capital Addition Purchase Commitments
Liability for estimated cost to comply with entrainment regulation	$ 600

Estimated undiscounted amount of the accrual required to comply with required entrainment regulation under the federal Clean Water Act Section 316(b) rule.

No definition available.

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Namespace Prefix:	sps_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant