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Property Plant and Equipment Joint Ownership (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 1,626 [1]
Accumulated Depreciation 506 [1]
Electric Generation | Hayden Unit 1  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 156
Accumulated Depreciation $ 99
Percent Owned 76.00%
Electric Generation | Hayden Unit 2  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 151
Accumulated Depreciation $ 78
Percent Owned 37.00%
Electric Generation | Hayden Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 42
Accumulated Depreciation $ 27
Percent Owned 53.00%
Electric Generation | Craig Units 1 and 2  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 81
Accumulated Depreciation $ 48
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 $ 917
Accumulated Depreciation $ 154
Percent Owned 67.00%
Electric Generation | Comanche Common Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 28
Accumulated Depreciation $ 2
Percent Owned 82.00%
Electric Transmission | Transmission and Other Facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service $ 182
Accumulated Depreciation 63
Gas Transportation | Rifle to Avon  
Jointly Owned Utility Plant Interests [Line Items]  
Plant in Service 22
Accumulated Depreciation $ 8
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 $3 million in CWIP.