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Selected Balance Sheet Data, Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 72,787 $ 69,692
Less accumulated depreciation and amortization (19,300) (18,399)
Property, plant and equipment, net 53,890 51,642
Electric plant    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 53,883 52,494
Natural gas plant    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 9,363 9,080
Common and other property    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,296 3,190
Plant to be retired    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross [1] 1,890 2,055
Construction work in progress    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,355 2,873
Nuclear fuel    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,444 3,337
Less accumulated depreciation and amortization $ (3,041) $ (2,988)
[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.