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Selected Balance Sheet Data, Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Public Utility, Property, Plant and Equipment [Line Items]    
Common and other property $ 3,370 $ 3,190
Plant to be retired [1] 1,846 2,055
Construction work in progress 4,851 2,873
Total property, plant and equipment 74,574 69,692
Less accumulated depreciation (19,632) (18,399)
Nuclear fuel 3,452 3,337
Less accumulated amortization (3,073) (2,988)
Property, plant and equipment, net 55,321 51,642
Electric plant    
Public Utility, Property, Plant and Equipment [Line Items]    
Plant 54,908 52,494
Natural gas plant    
Public Utility, Property, Plant and Equipment [Line Items]    
Plant $ 9,599 $ 9,080
[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. Amounts are presented net of accumulated depreciation.