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Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Depreciation, amortization, and accretion        
Property, plant, and equipment $ 243 $ 300    
Amortization of intangible assets, net 5 6    
Nuclear fuel 232 216    
ARO accretion 158 167    
Total depreciation, amortization, and accretion 640 694    
Other non-cash operating activities        
Other decommissioning related-activity (74) (161)    
Energy-related options (10) 27    
Pension and non-pension postretirement benefit costs 38 28    
Other 93 65    
Total other non-cash operating activities 47 (41)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 1,846 562 $ 3,022  
Restricted cash and cash equivalents 96 83 107  
Total cash, restricted cash, and cash equivalents 1,942 645 3,129 $ 454
Constellation Energy Generation, LLC        
Depreciation, amortization, and accretion        
Total depreciation, amortization, and accretion 640 694    
Other non-cash operating activities        
Other decommissioning related-activity (74) (161)    
Energy-related options (10) 27    
Pension and non-pension postretirement benefit costs 38 28    
Other 70 44    
Total other non-cash operating activities 24 (62)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 1,836 557 3,018  
Restricted cash and cash equivalents 86 67 97  
Total cash, restricted cash, and cash equivalents 1,922 624 $ 3,115 $ 440
Unamortized Energy Contracts        
Depreciation, amortization, and accretion        
Amortization of energy contract assets and liabilities $ 2 $ 5