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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000     $ 258,000,000    
Power Program Retained Earnings 14,167,000,000   14,167,000,000     13,689,000,000    
Nonpower Programs Appropriation Investment, Net 535,000,000   535,000,000     540,000,000    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (22,000,000)   (22,000,000)     (22,000,000)    
Total Proprietary Capital 14,938,000,000 $ 13,878,000,000 14,938,000,000 $ 13,878,000,000 $ 14,689,000,000 14,465,000,000 $ 13,639,000,000 $ 12,932,000,000
Net income (loss) 256,000,000 269,000,000 476,000,000 909,000,000        
Total other comprehensive income (loss) (6,000,000) (29,000,000) 0 44,000,000        
Return on power program appropriation investment (1,000,000) (1,000,000) (3,000,000) (3,000,000)        
New Accounting Standard - CECL       (4,000,000)        
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 0        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment 0 0 0 0        
New Accounting Standard - CECL       0        
Power Program Retained Earnings                
Power Program Retained Earnings 14,167,000,000 13,085,000,000 14,167,000,000 13,085,000,000 13,910,000,000 13,689,000,000 12,815,000,000 12,177,000,000
Net income (loss) 258,000,000 271,000,000 481,000,000 915,000,000        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment (1,000,000) (1,000,000) (3,000,000) (3,000,000)        
New Accounting Standard - CECL       (4,000,000)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 535,000,000 542,000,000 535,000,000 542,000,000 537,000,000 540,000,000 544,000,000 548,000,000
Net income (loss) (2,000,000) (2,000,000) (5,000,000) (6,000,000)        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment 0 0 0 0        
New Accounting Standard - CECL       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 (22,000,000) (7,000,000) (22,000,000) (7,000,000) $ (16,000,000) $ (22,000,000) $ 22,000,000 $ (51,000,000)
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss) (6,000,000) (29,000,000) 0 44,000,000        
Return on power program appropriation investment $ 0 $ 0 $ 0 0        
New Accounting Standard - CECL       $ 0