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Property Plant and Equipment Joint Ownership of Generation, Transmission and Gas Facilities (Details)
$ in Millions
Dec. 31, 2022
USD ($)
NSP Minnesota  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 1,686 [1]
Accumulated Depreciation 715 [1]
CWIP 4
NSP Minnesota | Electric Generation | Sherco Unit 3  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 623
Accumulated Depreciation $ 468
Percent Owned 59.00%
NSP Minnesota | Electric Generation | Sherco Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 180
Accumulated Depreciation $ 115
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 $ 3
Percent Owned 50.00%
NSP Minnesota | Electric Transmission | Huntley Wilmarth  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 49
Accumulated Depreciation $ 1
Percent Owned 50.00%
NSP Minnesota | Electric Transmission | CapX2020  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 818
Accumulated Depreciation $ 124
Percent Owned 51.00%
NSP-Wisconsin  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 343 [2]
Accumulated Depreciation 54 [2]
CWIP 1
NSP-Wisconsin | Electric Transmission | La Crosse, WI to Madison, WI  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 177
Accumulated Depreciation $ 20
Percent Owned 37.00%
NSP-Wisconsin | Electric Transmission | CapX2020  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 166
Accumulated Depreciation $ 34
Percent Owned 80.00%
PSCo  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 1,636 [3]
Accumulated Depreciation 544 [3]
CWIP 10
PSCo | Electric Generation | Hayden Unit 1  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 157
Accumulated Depreciation $ 99
Percent Owned 76.00%
PSCo | Electric Generation | Hayden Unit 2  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 151
Accumulated Depreciation $ 81
Percent Owned 37.00%
PSCo | Electric Generation | Hayden Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 42
Accumulated Depreciation $ 29
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 $ 51
Percent Owned 10.00%
PSCo | Electric Generation | Craig Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 39
Accumulated Depreciation $ 24
Percent Owned 7.00%
PSCo | Electric Generation | Comanche Unit 3  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 918
Accumulated Depreciation $ 174
Percent Owned 67.00%
PSCo | Electric Generation | Comanche Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 28
Accumulated Depreciation $ 3
Percent Owned 82.00%
PSCo | Electric Transmission | Transmission and other facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 186
Accumulated Depreciation 72
PSCo | Gas Transportation | Rifle, CO to Avon, CO  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 25
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 $4 million in CWIP.
[2] Projects additionally include $1 million in CWIP.
[3] Projects additionally include $10 million in CWIP.