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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - Bonds [Member] - USD ($) | Jun. 15, 2020 | May 26, 2020 | May 18, 2020 | May 15, 2020 | Apr. 01, 2020
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XCEL ENERGY INC [Member] | Series due June 1, 2030 [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.40%
XCEL ENERGY INC [Member] | Series Due October 15, 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 500,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.50% |  |  |  |
PSCo [Member] | Series Due June 1, 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 375,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.70% |
PSCo [Member] | Series due Jan. 15, 2031 [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 375,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.90% |
SPS | Series Due 2050 [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 350,000,000 |  |
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 |  | 3.05% |  |  |
NSP Minnesota [Member] | Series Due June 1, 2051 [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 700,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.60% |  |  |  |

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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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 + Details
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