XML 52 R39.htm IDEA: XBRL DOCUMENT v3.24.0.1
Property Plant and Equipment Joint Ownership (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 1,643 [1]
Accumulated Depreciation 587 [1]
CWIP 18
Electric Generation | Hayden Unit 1  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 157
Accumulated Depreciation $ 108
Percent Owned 76.00%
Electric Generation | Hayden Unit 2  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 151
Accumulated Depreciation $ 87
Percent Owned 37.00%
Electric Generation | Hayden Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 44
Accumulated Depreciation $ 31
Percent Owned 53.00%
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%
Electric Generation | Craig Common Facilities 1, 2 and 3  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 39
Accumulated Depreciation $ 25
Percent Owned 7.00%
Electric Generation | Comanche Unit 3  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 916
Accumulated Depreciation $ 191
Percent Owned 67.00%
Electric Generation | Comanche Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 29
Accumulated Depreciation $ 4
Percent Owned 77.00%
Electric Transmission | Transmission and Other Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 189
Accumulated Depreciation 75
Gas Transportation | Rifle to Avon  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 28
Accumulated Depreciation $ 9
Percent Owned 60.00%
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 $18 million in CWIP.