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Borrowings and Other Financing Instruments Dividend and Other Capital-Related Restrictions (Details) $ in Millions | Dec. 31, 2023 USD ($)
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NSP Minnesota |  |
Debt Instrument [Line Items] |  |
Equity to total capitalization ratio, low end of range (in hundredths) | 47.20% |
Equity to total capitalization ratio, high end of range (in hundredths) | 57.60% |
Equity to total capitalization ratio | 52.30% |
Unrestricted Retained Earnings Per State Regulatory Commissions Dividend Restrictions | $ 1,508 |
Capitalization, Short term debt, long term debt and equity | 15,702 |
Maximum total capitalization | 16,140 |
Maximum additional short term debt authorized for issuance | $ 2,400 | [1]
Maximum percentage of short term debt to total capitalization (in hundredths) | 15.00% |
NSP-Wisconsin |  |
Debt Instrument [Line Items] |  |
Minimum calendar year average equity to total capitalization ratio authorized by state commission | 52.50% | [2]
Equity to total capitalization ratio | 52.70% | [2]
Unrestricted Retained Earnings Per State Regulatory Commissions Dividend Restrictions | $ 9 |
Capitalization, Short term debt, long term debt and equity | 2,520 |
Maximum additional long term debt authorized for issuance | 625 |
Maximum additional short term debt authorized for issuance | $ 150 |
SPS |  |
Debt Instrument [Line Items] |  |
Equity to total capitalization ratio (excluding short-term debt), low end of range (in hundredths) | 45.00% | [3]
Equity to total capitalization ratio (excluding short-term debt), high end of range (in hundredths) | 55.00% | [3]
Equity to total capitalization ratio (excluding short-term debt) (in hundredths) | 54.60% | [3]
Unrestricted Retained Earnings Per State Regulatory Commissions Dividend Restrictions | $ 617 | [4]
Capitalization, Short term debt, long term debt and equity | 7,298 | [4]
Maximum additional long term debt authorized for issuance | 100 |
Maximum additional short term debt authorized for issuance | 600 |
PSCo |  |
Debt Instrument [Line Items] |  |
Maximum additional long term debt authorized for issuance | 450 |
Maximum additional short term debt authorized for issuance | $ 800 |
[1] | NSP-Minnesota has authorization to issue long-term securities provided the equity-to-total capitalization remains within the required range, and to issue short-term debt provided it does not exceed 15% of total capitalization.
[2] | Cannot pay annual dividends in excess of forecasted levels if its average equity-to-total capitalization ratio falls below the commission authorized level.
[3] | Excludes short-term debt.
[4] | May not pay a dividend that would cause a loss of its investment grade bond rating.

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