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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Net income (loss) $ 1,135 $ 500 $ 1,108  
Total other comprehensive income (loss) (23) 57 (64)  
Return on power program appropriation investment (7) (6) (4)  
Appropriation-investment power program 258 258    
Retained Earnings Power Program 16,437 15,302    
Appropriation investment nonpower programs, net 518 525    
Accumulated other comprehensive income (loss) (52) (29)    
Proprietary Capital 17,161 16,056 15,505 $ 14,465
Power Program Appropriation Investment        
Net income (loss) 0 0 0  
Total other comprehensive income (loss) 0 0 0  
Return on power program appropriation investment 0 0 0  
Appropriation-investment power program 258 258 258 258
Power Program Retained Earnings        
Net income (loss) 1,142 508 1,115  
Total other comprehensive income (loss) 0 0 0  
Return on power program appropriation investment (7) (6) 4  
Retained Earnings Power Program 16,437 15,302 14,800 13,689
Nonpower Programs Appropriation Investment, Net        
Net income (loss) (7) (8) (7)  
Total other comprehensive income (loss) 0 0 0  
Return on power program appropriation investment 0 0 0  
Appropriation investment nonpower programs, net 518 525 533 540
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges        
Net income (loss) 0 0 0  
Total other comprehensive income (loss) (23) 57 (64)  
Return on power program appropriation investment 0 0 0  
Accumulated other comprehensive income (loss) $ (52) $ (29) $ (86) $ (22)