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Supplementary Financial Information - Schedule 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, gross $ 18,028 $ 17,344
Less accumulated depreciation (6,657) (5,753)
Net of accumulated depreciation 11,371 11,591
Finance lease right-of-use assets (net of accumulated depreciation) 160 173
Nuclear fuel (net of accumulated amortization of $120 million and $152 million) 379 268
Construction work in progress 522 522
Property, plant and equipment — net 12,432 12,554
Power generation and structures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 17,297 16,597
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 572 584
Office and other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 159 163
Nuclear Fuel    
Property, Plant and Equipment [Line Items]    
Less accumulated depreciation $ (120) $ (152)