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Jointly Owned Utility Facilities - PAC (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Jointly Owned Utility Plant Interests [Line Items]  
Facility in service $ 10,659
Accumulated depreciation 6,459
Construction work in progress 322
PAC  
Jointly Owned Utility Plant Interests [Line Items]  
Facility in service 4,760
Accumulated depreciation 2,690
Construction work in progress $ 227
PAC | Jim Bridger Nos. 1-4  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 67.00%
Facility in service $ 1,596
Accumulated depreciation 996
Construction work in progress $ 26
PAC | Hunter No. 1  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 94.00%
Facility in service $ 510
Accumulated depreciation 237
Construction work in progress $ 4
PAC | Hunter No. 2  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 60.00%
Facility in service $ 316
Accumulated depreciation 151
Construction work in progress $ 2
PAC | Wyodak  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 80.00%
Facility in service $ 491
Accumulated depreciation 285
Construction work in progress $ 0
PAC | Colstrip Nos. 3 and 4  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 10.00%
Facility in service $ 262
Accumulated depreciation 199
Construction work in progress $ 0
PAC | Hermiston  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 50.00%
Facility in service $ 191
Accumulated depreciation 111
Construction work in progress $ 3
PAC | Craig Nos. 1 and 2  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 19.00%
Facility in service $ 372
Accumulated depreciation 341
Construction work in progress $ 0
PAC | Hayden No. 1  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 25.00%
Facility in service $ 77
Accumulated depreciation 55
Construction work in progress $ 0
PAC | Hayden No. 2  
Jointly Owned Utility Plant Interests [Line Items]  
Ownership share 13.00%
Facility in service $ 45
Accumulated depreciation 32
Construction work in progress 0
PAC | Transmission and distribution facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Facility in service 900
Accumulated depreciation 283
Construction work in progress $ 192