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Borrowings and Other Financing Instruments Bilateral Credit Agreement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,079	$ 813
Letter of Credit
Short-term Debt [Line Items]
Debt Instrument, Term	1 year
Amount outstanding at period end	$ 43	$ 43
Bilateral Credit Agreement [Member] | NSP-Minnesota | Letter of Credit
Short-term Debt [Line Items]
Debt Instrument, Term	1 year
Amount outstanding at period end	$ 53
Credit Facility	$ 75

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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Balance Type:	credit
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X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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