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Property Plant and Equipment Joint Ownership of Generation, Transmission and Gas Facilities (Details) $ in Millions | Dec. 31, 2024 USD ($)
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NSP Minnesota |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 1,745 | [1]
Accumulated Depreciation | 798 | [1]
CWIP | 10 |
NSP Minnesota | Electric Generation | Sherco Unit 3 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 636 |
Accumulated Depreciation | $ 499 |
Percent Owned | 59.00% |
NSP Minnesota | Electric Generation | Sherco Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 189 |
Accumulated Depreciation | $ 128 |
Percent Owned | 80.00% |
NSP Minnesota | Electric Generation | Sherco substation |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 5 |
Accumulated Depreciation | $ 4 |
Percent Owned | 59.00% |
NSP Minnesota | Electric Transmission | Grand Meadow |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 11 |
Accumulated Depreciation | $ 4 |
Percent Owned | 50.00% |
NSP Minnesota | Electric Transmission | Huntley Wilmarth |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 49 |
Accumulated Depreciation | $ 3 |
Percent Owned | 50.00% |
NSP Minnesota | Electric Transmission | CapX2020 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 855 |
Accumulated Depreciation | $ 160 |
Percent Owned | 51.00% |
NSP-Wisconsin |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 348 | [2]
Accumulated Depreciation | 74 | [2]
CWIP | 1 |
NSP-Wisconsin | Electric Transmission | La Crosse, WI to Madison, WI |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 179 |
Accumulated Depreciation | $ 30 |
Percent Owned | 37.00% |
NSP-Wisconsin | Electric Transmission | CapX2020 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 169 |
Accumulated Depreciation | $ 44 |
Percent Owned | 80.00% |
PSCo |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 1,665 | [3]
Accumulated Depreciation | 633 | [3]
CWIP | 28 |
PSCo | Electric Generation | Hayden Unit 1 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 158 |
Accumulated Depreciation | $ 117 |
Percent Owned | 76.00% |
PSCo | Electric Generation | Hayden Unit 2 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 152 |
Accumulated Depreciation | $ 93 |
Percent Owned | 37.00% |
PSCo | Electric Generation | Hayden Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 45 |
Accumulated Depreciation | $ 33 |
Percent Owned | 53.00% |
PSCo | Electric Generation | Craig Units 1 and 2 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 82 |
Accumulated Depreciation | $ 58 |
Percent Owned | 10.00% |
PSCo | Electric Generation | Craig Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 40 |
Accumulated Depreciation | $ 27 |
Percent Owned | 7.00% |
PSCo | Electric Generation | Comanche Unit 3 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 933 |
Accumulated Depreciation | $ 212 |
Percent Owned | 67.00% |
PSCo | Electric Generation | Comanche Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 29 |
Accumulated Depreciation | $ 5 |
Percent Owned | 77.00% |
PSCo | Electric Transmission | Transmission and other facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 190 |
Accumulated Depreciation | 75 |
PSCo | Gas Transportation | Rifle, CO to Avon, CO |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 28 |
Accumulated Depreciation | $ 10 |
Percent Owned | 60.00% |
PSCo | Gas Transportation | Gas Transportation Compressor |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 8 |
Accumulated Depreciation | $ 3 |
Percent Owned | 50.00% |
[1] | Projects additionally include $10 million in CWIP.
[2] | Projects additionally include $1 million in CWIP.
[3] | Projects additionally include $28 million in CWIP.

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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