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Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Depreciation, amortization, and accretion            
Property, plant, and equipment     $ 850 $ 791    
Amortization of intangible assets, net     18 17    
Nuclear fuel     656 573    
ARO accretion     498 433    
Total depreciation, amortization, and accretion     2,049 1,840    
Other non-cash operating activities            
Other decommissioning related-activity     (488) (330)    
Energy-related options     40 159    
Asset impairments     6 71    
(Gain) loss on sale of receivables $ 11 $ 12 43 58    
Amortization of operating ROU asset     57 57    
Long-term incentive plan     31 44    
Pension and OPEB costs     81 36    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]            
Cash and cash equivalents 1,793 1,889 1,793 1,889 $ 368  
Restricted cash and cash equivalents 89 88 89 88 86  
Total cash, restricted cash, and cash equivalents 1,882 1,977 1,882 1,977 454 $ 528
Constellation Energy Generation, LLC            
Depreciation, amortization, and accretion            
Total depreciation, amortization, and accretion     2,049 1,840    
Other non-cash operating activities            
Other decommissioning related-activity     (488) (330)    
Energy-related options     40 159    
Asset impairments     6 71    
(Gain) loss on sale of receivables     43 58    
Amortization of operating ROU asset     57 57    
Long-term incentive plan     0 0    
Pension and OPEB costs     81 36    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]            
Cash and cash equivalents 1,793 1,888 1,793 1,888 366  
Restricted cash and cash equivalents 77 59 77 59 74  
Total cash, restricted cash, and cash equivalents $ 1,870 $ 1,947 1,870 1,947 $ 440 $ 501
Unamortized Energy Contracts            
Depreciation, amortization, and accretion            
Amortization of energy contract assets and liabilities     $ 27 $ 26