v3.25.2
Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Depreciation, amortization, and accretion        
Property, plant, and equipment $ 492 $ 590    
Nuclear fuel 468 433    
ARO accretion 318 336    
Amortization of intangible assets, net 10 12    
Total depreciation, amortization, and accretion 1,300 1,388    
Other non-cash operating activities        
Other decommissioning related-activity (224) (246)    
Pension and non-pension postretirement benefit costs 76 56    
Energy-related options (23) 30    
Other 150 95    
Total other non-cash operating activities (21) (65)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 1,974 311 $ 3,022  
Restricted cash and cash equivalents 88 72 107  
Total cash, restricted cash, and cash equivalents 2,062 383 3,129 $ 454
Constellation Energy Generation, LLC        
Depreciation, amortization, and accretion        
Total depreciation, amortization, and accretion 1,300 1,388    
Other non-cash operating activities        
Other decommissioning related-activity (224) (246)    
Pension and non-pension postretirement benefit costs 76 56    
Energy-related options (23) 30    
Other 101 78    
Total other non-cash operating activities (70) (82)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 1,964 308 3,018  
Restricted cash and cash equivalents 76 64 97  
Total cash, restricted cash, and cash equivalents 2,040 372 $ 3,115 $ 440
Unamortized Energy Contracts        
Depreciation, amortization, and accretion        
Amortization of energy contract assets and liabilities $ 12 $ 17