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Property Plant and Equipment Major classes of property, plant and equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 69,692 $ 65,464
Accumulated depreciation and amortization (18,399) (17,502)
Property, plant and equipment, net 51,642 48,253
Electric plant    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 52,494 49,639
Natural gas plant    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 9,080 8,514
Common and other property    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 3,190 2,970
Plant to be retired    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment [1] 2,055 2,217
CWIP    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 2,873 2,124
Nuclear fuel    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 3,337 3,183
Accumulated depreciation and amortization $ (2,988) $ (2,892)
[1] Amounts include Sherco 1 and 3 and A.S. King for NSP-Minnesota; Comanche Units 2 and 3, Craig Units 1 and 2, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion for PSCo; and Tolk Unit 1 and 2 and coal generation assets at Harrington pending facility gas conversion for SPS. The Dec. 31, 2022 balance also includes Sherco 2, which was retired on Dec. 31, 2023. Amounts are presented net of accumulated depreciation.