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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000     $ 258,000,000    
Power Program Retained Earnings 13,085,000,000   13,085,000,000     12,177,000,000    
Nonpower Programs Appropriation Investment, Net 542,000,000   542,000,000     548,000,000    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (7,000,000)   (7,000,000)     (51,000,000)    
Total Proprietary Capital 13,878,000,000 $ 12,206,000,000 13,878,000,000 $ 12,206,000,000 $ 13,639,000,000 12,932,000,000 $ 11,979,000,000 $ 11,625,000,000
Net income (loss) 269,000,000 205,000,000 909,000,000 652,000,000        
Total other comprehensive income (loss) (29,000,000) 24,000,000 44,000,000 (66,000,000)        
Return on power program appropriation investment (1,000,000) (2,000,000) (3,000,000) (5,000,000)        
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 13,085,000,000 11,476,000,000 13,085,000,000 11,476,000,000 12,815,000,000 12,177,000,000 11,271,000,000 10,823,000,000
Net income (loss) 271,000,000 207,000,000 915,000,000 658,000,000        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment (1,000,000) (2,000,000) (3,000,000) (5,000,000)        
New Accounting Standard - CECL (4,000,000)              
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 542,000,000 550,000,000 542,000,000 550,000,000 544,000,000 548,000,000 552,000,000 556,000,000
Net income (loss) (2,000,000) (2,000,000) (6,000,000) (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 (7,000,000) (78,000,000) (7,000,000) (78,000,000) $ 22,000,000 $ (51,000,000) $ (102,000,000) $ (12,000,000)
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss) (29,000,000) 24,000,000 44,000,000 (66,000,000)        
Return on power program appropriation investment 0 $ 0 $ 0 $ 0        
New Accounting Standard - CECL $ 0