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State Audits (Details) $ in Millions	Dec. 31, 2025 USD ($)
Statement of Financial Position [Abstract]
state audits	$ 0

X

- Definition

state audits

+ References

No definition available.

+ Details

Name:	sps_StateAudits
Namespace Prefix:	sps_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration