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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Power Program Appropriation Investment $ 258,000,000      
Power Program Retained Earnings 16,562,000,000      
Nonpower Programs Appropriation Investment, Net 516,000,000      
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (34,000,000)      
Total Proprietary Capital 17,302,000,000 $ 16,182,000,000 $ 17,161,000,000 $ 16,056,000,000
Net income (loss) 125,000,000 127,000,000    
Total other comprehensive income (loss) 18,000,000 1,000,000    
Return on power program appropriation investment (2,000,000) (2,000,000)    
Power Program Appropriation Investment        
Power Program Appropriation Investment 258,000,000 258,000,000 258,000,000 258,000,000
Net income (loss) 0 0    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment 0 0    
Power Program Retained Earnings        
Power Program Retained Earnings 16,562,000,000 15,429,000,000 16,437,000,000 15,302,000,000
Net income (loss) 127,000,000 129,000,000    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment (2,000,000) (2,000,000)    
Nonpower Programs Appropriation Investment, Net        
Nonpower Programs Appropriation Investment, Net 516,000,000 523,000,000 518,000,000 525,000,000
Net income (loss) (2,000,000) (2,000,000)    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment 0 0    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (34,000,000) (28,000,000) $ (52,000,000) $ (29,000,000)
Net income (loss) 0 0    
Total other comprehensive income (loss) 18,000,000 1,000,000    
Return on power program appropriation investment $ 0 $ 0