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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2024
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000            
Power Program Retained Earnings 16,970,000,000   16,970,000,000            
Nonpower Programs Appropriation Investment, Net 514,000,000   514,000,000            
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (52,000,000) $ (26,000,000) (52,000,000) $ (26,000,000) $ (26,000,000) $ (34,000,000) $ (52,000,000) $ (28,000,000) $ (29,000,000)
Total Proprietary Capital 17,690,000,000 16,489,000,000 17,690,000,000 16,489,000,000 16,489,000,000 17,302,000,000 17,161,000,000 16,182,000,000 16,056,000,000
Net income (loss) 408,000,000 307,000,000 533,000,000 434,000,000 434,000,000        
Total other comprehensive income (loss) (18,000,000) 2,000,000 0 3,000,000 3,000,000        
Return on power program appropriation investment (2,000,000) (2,000,000) (4,000,000)   (4,000,000)        
Power Program Appropriation Investment                  
Power Program Appropriation Investment 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000
Net income (loss) 0 0 0 0          
Total other comprehensive income (loss) 0 0 0 0          
Return on power program appropriation investment 0 0 0 0          
Power Program Retained Earnings                  
Power Program Retained Earnings 16,970,000,000 15,736,000,000 16,970,000,000 15,736,000,000 15,736,000,000 16,562,000,000 16,437,000,000 15,429,000,000 15,302,000,000
Net income (loss) 410,000,000 309,000,000 537,000,000 438,000,000          
Total other comprehensive income (loss) 0 0 0 0          
Return on power program appropriation investment (2,000,000) (2,000,000) (4,000,000) (4,000,000)          
Nonpower Programs Appropriation Investment, Net                  
Nonpower Programs Appropriation Investment, Net 514,000,000 521,000,000 514,000,000 521,000,000 $ 521,000,000 $ 516,000,000 $ 518,000,000 $ 523,000,000 $ 525,000,000
Net income (loss) (2,000,000) (2,000,000) (4,000,000) (4,000,000)          
Total other comprehensive income (loss) 0 0 0 0          
Return on power program appropriation investment 0 0 0 0          
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges                  
Net income (loss) 0 0 0 0          
Total other comprehensive income (loss) (18,000,000) 2,000,000 0 3,000,000          
Return on power program appropriation investment $ 0 $ 0 $ 0 $ 0