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Property Plant and Equipment Joint Ownership of Generation, Transmission and Gas Facilities (Details) $ in Millions | Dec. 31, 2023 USD ($)
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NSP Minnesota |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 1,703 | [1]
Accumulated Depreciation | 752 | [1]
CWIP | 2 |
NSP Minnesota | Electric Generation | Sherco Unit 3 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 633 |
Accumulated Depreciation | $ 480 |
Percent Owned | 59.00% |
NSP Minnesota | Electric Generation | Sherco Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 185 |
Accumulated Depreciation | $ 121 |
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 | $ 2 |
Percent Owned | 50.00% |
NSP Minnesota | Electric Transmission | CapX2020 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 820 |
Accumulated Depreciation | $ 141 |
Percent Owned | 51.00% |
NSP-Wisconsin |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 347 | [2]
Accumulated Depreciation | 64 | [2]
CWIP | 1 |
NSP-Wisconsin | Electric Transmission | La Crosse, WI to Madison, WI |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 178 |
Accumulated Depreciation | $ 25 |
Percent Owned | 37.00% |
NSP-Wisconsin | Electric Transmission | CapX2020 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 169 |
Accumulated Depreciation | $ 39 |
Percent Owned | 80.00% |
PSCo |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 1,643 | [3]
Accumulated Depreciation | 587 | [3]
CWIP | 18 |
PSCo | Electric Generation | Hayden Unit 1 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 157 |
Accumulated Depreciation | $ 108 |
Percent Owned | 76.00% |
PSCo | Electric Generation | Hayden Unit 2 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 151 |
Accumulated Depreciation | $ 87 |
Percent Owned | 37.00% |
PSCo | Electric Generation | Hayden Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 44 |
Accumulated Depreciation | $ 31 |
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 | $ 55 |
Percent Owned | 10.00% |
PSCo | Electric Generation | Craig Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 39 |
Accumulated Depreciation | $ 25 |
Percent Owned | 7.00% |
PSCo | Electric Generation | Comanche Unit 3 |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 916 |
Accumulated Depreciation | $ 191 |
Percent Owned | 67.00% |
PSCo | Electric Generation | Comanche Common Facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 29 |
Accumulated Depreciation | $ 4 |
Percent Owned | 77.00% |
PSCo | Electric Transmission | Transmission and other facilities |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 189 |
Accumulated Depreciation | 75 |
PSCo | Gas Transportation | Rifle, CO to Avon, CO |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 28 |
Accumulated Depreciation | $ 9 |
Percent Owned | 60.00% |
PSCo | Gas Transportation | Gas Transportation Compressor |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 8 |
Accumulated Depreciation | $ 2 |
Percent Owned | 50.00% |
[1] | Projects additionally include $2 million in CWIP.
[2] | Projects additionally include $1 million in CWIP.
[3] | Projects additionally include $18 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//1943274/2147479960/980-360-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//1943274/2147479960/980-360-S99-1 + Details
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