v3.26.1
Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Depreciation, amortization, and accretion        
PP&E $ 436 $ 243    
Nuclear fuel 244 232    
Amortization of acquired derivative contracts 228 0    
ARO accretion 174 158    
Amortization of intangible assets, net 7 5    
Other amortization (15) 0    
Total 1,202 640    
Other non-cash operating activities        
Other decommissioning related-activity (349) (74)    
Pension and non-pension postretirement benefit costs 50 38    
Other 100 83    
Total (199) 47    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 800 1,846 $ 3,641  
Restricted cash and cash equivalents 371 96 107  
Total cash, restricted cash, and cash equivalents 1,171 1,942 3,748 $ 3,129
Constellation Energy Generation, LLC        
Depreciation, amortization, and accretion        
Total 1,202 640    
Other non-cash operating activities        
Other decommissioning related-activity (349) (74)    
Pension and non-pension postretirement benefit costs 50 38    
Other 70 60    
Total (229) 24    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 785 1,836 3,641  
Restricted cash and cash equivalents 351 86 79  
Total cash, restricted cash, and cash equivalents 1,136 1,922 $ 3,720 $ 3,115
Unamortized Energy Contracts        
Depreciation, amortization, and accretion        
Amortization of UECs $ 128 $ 2