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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000          
Power Program Retained Earnings 15,736,000,000   15,736,000,000          
Nonpower Programs Appropriation Investment, Net 521,000,000   521,000,000          
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (26,000,000)   (26,000,000)          
Total Proprietary Capital 16,489,000,000 $ 15,682,000,000 16,489,000,000 $ 15,682,000,000 $ 16,182,000,000 $ 16,056,000,000 $ 15,642,000,000 $ 15,505,000,000
Net income (loss) 307,000,000 48,000,000 434,000,000 149,000,000        
Total other comprehensive income (loss) 2,000,000 (6,000,000) 3,000,000 31,000,000        
Return on power program appropriation investment (2,000,000) (2,000,000) (4,000,000) (3,000,000)        
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
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 15,736,000,000 14,950,000,000 15,736,000,000 14,950,000,000 15,429,000,000 15,302,000,000 14,902,000,000 14,800,000,000
Net income (loss) 309,000,000 50,000,000 438,000,000 153,000,000        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment (2,000,000) (2,000,000) (4,000,000) (3,000,000)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 521,000,000 529,000,000 521,000,000 529,000,000 523,000,000 525,000,000 531,000,000 533,000,000
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                
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (26,000,000) (55,000,000) (26,000,000) (55,000,000) $ (28,000,000) $ (29,000,000) $ (49,000,000) $ (86,000,000)
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss) 2,000,000 (6,000,000) 3,000,000 31,000,000        
Return on power program appropriation investment $ 0 $ 0 $ 0 $ 0