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Property Plant and Equipment Joint Ownership of Generation, Transmission and Gas Facilities (Details)
$ in Millions

Dec. 31, 2023

USD ($)

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.

X

- 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
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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
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-Section S99
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+ References

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