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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000  
Power Program Retained Earnings 14,902,000,000   14,800,000,000  
Nonpower Programs Appropriation Investment, Net 531,000,000   533,000,000  
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (49,000,000)   (86,000,000)  
Total Proprietary Capital 15,642,000,000 $ 14,479,000,000 15,505,000,000 $ 14,465,000,000
Net income (loss) 101,000,000 11,000,000    
Total other comprehensive income (loss) 37,000,000 4,000,000    
Return on power program appropriation investment (1,000,000) (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 14,902,000,000 13,701,000,000 14,800,000,000 13,689,000,000
Net income (loss) 103,000,000 13,000,000    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment (1,000,000) (1,000,000)    
Nonpower Programs Appropriation Investment, Net        
Nonpower Programs Appropriation Investment, Net 531,000,000 538,000,000 533,000,000 540,000,000
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 (49,000,000) (18,000,000) $ (86,000,000) $ (22,000,000)
Net income (loss) 0 0    
Total other comprehensive income (loss) 37,000,000 4,000,000    
Return on power program appropriation investment $ 0 $ 0