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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - Bonds [Member] - USD ($)	Jul. 19, 2021	Mar. 23, 2021	Mar. 02, 2021	Mar. 01, 2021
PSCo | Series Due June 15, 2031
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage				1.875%
SPS | Series Due 2050
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage			3.15%
NSP-Wisconsin | Series Due May 1, 2051 [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.82%
NSP-Minnesota | Series Due April 1, 2031
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 425,000,000
Debt Instrument, Interest Rate, Stated Percentage		2.25%
NSP-Minnesota | Series Due April 1, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 425,000,000
Debt Instrument, Interest Rate, Stated Percentage		3.20%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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