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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Feb. 17, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,747,000,000			$ 584,000,000
Proceeds from issuance of common stock	13,000,000	$ 5,000,000
Expiration Period, Line of Credit			$ 364
Letter of Credit
Short-term Debt [Line Items]
Amount outstanding at period end	19,000,000			$ 20,000,000
364-Day Term Loan [Member] | Short-term Debt [Member] | Xcel Energy Inc.
Short-term Debt [Line Items]
Credit Facility	1,200,000,000		$ 1,200,000,000
Required debt to total capitalization ratio			6500.00%
Amount outstanding at period end	1,200,000,000
Available	$ 0

X

- 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

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-Publisher FASB
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-SubTopic 10
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-Paragraph 1
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The cash inflow from the additional capital contribution to the entity.

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- 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.

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Required debt to total capitalization ratio

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