v3.25.2
Asset Retirement Obligations (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Asset Retirement Obligations    
Asset Retirement Obligation, Period Increase (Decrease) $ 118  
Amortization and Depreciation of Decontaminating and Decommissioning Assets 165  
Asset Retirement Obligation, Beginning Balance 10,806  
Settlements (187)  
Asset Retirement Obligation, Revision of Estimate (22)  
Accretion Expense, Including Asset Retirement Obligations 327  
Asset Retirement Obligation, Ending Balance 10,924  
Current portion of ARO (316) $ (283)
Change in closure liabilities (34)  
Increase in Asset Retirement Obligation, Revision in Estimate 16  
Nuclear    
Asset Retirement Obligations    
Asset Retirement Obligation, Beginning Balance 3,814  
Settlements (9)  
Asset Retirement Obligation, Revision of Estimate 2  
Accretion Expense, Including Asset Retirement Obligations 130  
Asset Retirement Obligation, Ending Balance 3,937  
Non-nuclear    
Asset Retirement Obligations    
Asset Retirement Obligation, Beginning Balance 6,992  
Settlements (178)  
Asset Retirement Obligation, Revision of Estimate (24)  
Accretion Expense, Including Asset Retirement Obligations 197  
Asset Retirement Obligation, Ending Balance $ 6,987