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Property Plant and Equipment Joint Ownership of Generation, Transmission and Gas Facilities (Details)
$ in Millions
Dec. 31, 2024
USD ($)
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.