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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000     $ 258,000,000    
Power Program Retained Earnings 14,950,000,000   14,950,000,000     14,800,000,000    
Nonpower Programs Appropriation Investment, Net 529,000,000   529,000,000     533,000,000    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (55,000,000)   (55,000,000)     (86,000,000)    
Total Proprietary Capital 15,682,000,000 $ 14,689,000,000 15,682,000,000 $ 14,689,000,000 $ 15,642,000,000 15,505,000,000 $ 14,479,000,000 $ 14,465,000,000
Net income (loss) 48,000,000 209,000,000 149,000,000 220,000,000        
Total other comprehensive income (loss) (6,000,000) 2,000,000 31,000,000 6,000,000        
Return on power program appropriation investment (2,000,000) (1,000,000) (3,000,000) (2,000,000)        
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 0        
Return on power program appropriation investment   0 0 0        
Power Program Retained Earnings                
Power Program Retained Earnings 14,950,000,000 13,910,000,000 14,950,000,000 13,910,000,000 14,902,000,000 14,800,000,000 13,701,000,000 13,689,000,000
Net income (loss) 50,000,000 210,000,000 153,000,000 223,000,000        
Total other comprehensive income (loss)   0 0 0        
Return on power program appropriation investment (2,000,000) (1,000,000) (3,000,000) (2,000,000)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 529,000,000 537,000,000 529,000,000 537,000,000 531,000,000 533,000,000 538,000,000 540,000,000
Net income (loss) (2,000,000) (1,000,000) (4,000,000) (3,000,000)        
Total other comprehensive income (loss)   0 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 (55,000,000) (16,000,000) (55,000,000) (16,000,000) $ (49,000,000) $ (86,000,000) $ (18,000,000) $ (22,000,000)
Net income (loss)   0 0 0        
Total other comprehensive income (loss) $ (6,000,000) 2,000,000 31,000,000 6,000,000        
Return on power program appropriation investment   $ 0 $ 0 $ 0