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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000     $ 258,000,000    
Power Program Retained Earnings 14,893,000,000   14,893,000,000     14,800,000,000    
Nonpower Programs Appropriation Investment, Net 527,000,000   527,000,000     533,000,000    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (72,000,000)   (72,000,000)     (86,000,000)    
Total Proprietary Capital 15,606,000,000 $ 14,938,000,000 15,606,000,000 $ 14,938,000,000 $ 15,682,000,000 15,505,000,000 $ 14,689,000,000 $ 14,465,000,000
Net income (loss) (58,000,000) 256,000,000 91,000,000 476,000,000        
Total other comprehensive income (loss) (17,000,000) (6,000,000) 14,000,000 0        
Return on power program appropriation investment (1,000,000) (1,000,000) (4,000,000) (3,000,000)        
Power Program Appropriation Investment                
Power Program Appropriation Investment 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000
Net income (loss)   0 0 0        
Total other comprehensive income (loss)   0 0          
Return on power program appropriation investment   0 0 0        
Power Program Retained Earnings                
Power Program Retained Earnings 14,893,000,000 14,167,000,000 14,893,000,000 14,167,000,000 14,950,000,000 14,800,000,000 13,910,000,000 13,689,000,000
Net income (loss) (56,000,000) 258,000,000 97,000,000 481,000,000        
Total other comprehensive income (loss)   0 0          
Return on power program appropriation investment (1,000,000) (1,000,000) (4,000,000) (3,000,000)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 527,000,000 535,000,000 527,000,000 535,000,000 529,000,000 533,000,000 537,000,000 540,000,000
Net income (loss) (2,000,000) (2,000,000) (6,000,000) (5,000,000)        
Total other comprehensive income (loss)   0 0          
Return on power program appropriation investment   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 (72,000,000) (22,000,000) (72,000,000) (22,000,000) $ (55,000,000) $ (86,000,000) $ (16,000,000) $ (22,000,000)
Net income (loss)   0 0 0        
Total other comprehensive income (loss) $ (17,000,000) (6,000,000) 14,000,000          
Return on power program appropriation investment   $ 0 $ 0 $ 0