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Selected Balance Sheet Data, Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Public Utility, Property, Plant and Equipment [Line Items]    
Common and other property $ 3,702 $ 3,515
Plant to be retired [1] 1,640 1,793
Construction work in progress 8,017 4,720
Total property, plant and equipment 83,635 76,653
Less accumulated depreciation (20,957) (19,852)
Nuclear fuel 3,634 3,491
Less accumulated amortization (3,181) (3,094)
Property, plant and equipment, net 63,131 57,198
Electric plant    
Public Utility, Property, Plant and Equipment [Line Items]    
Plant 59,976 56,791
Natural gas plant    
Public Utility, Property, Plant and Equipment [Line Items]    
Plant $ 10,300 $ 9,834
[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 for SPS. Amounts are presented net of accumulated depreciation.