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Plan Amendments (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
plan ammendments	$ 0	$ 0

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- Definition

plan ammendments

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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