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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000  
Power Program Retained Earnings 15,429,000,000   15,302,000,000  
Nonpower Programs Appropriation Investment, Net 523,000,000   525,000,000  
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (28,000,000)   (29,000,000)  
Total Proprietary Capital 16,182,000,000 $ 15,642,000,000 16,056,000,000 $ 15,505,000,000
Net income (loss) 127,000,000 101,000,000    
Total other comprehensive income (loss) 1,000,000 37,000,000    
Return on power program appropriation investment (2,000,000) (1,000,000)    
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 15,429,000,000 14,902,000,000 15,302,000,000 14,800,000,000
Net income (loss) 129,000,000 103,000,000    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment (2,000,000) (1,000,000)    
Nonpower Programs Appropriation Investment, Net        
Nonpower Programs Appropriation Investment, Net 523,000,000 531,000,000 525,000,000 533,000,000
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 (28,000,000) (49,000,000) $ (29,000,000) $ (86,000,000)
Net income (loss) 0 0    
Total other comprehensive income (loss) 1,000,000 37,000,000    
Return on power program appropriation investment $ 0 $ 0