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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000     $ 258,000,000    
Power Program Retained Earnings 11,476,000,000   11,476,000,000     10,823,000,000    
Nonpower Programs Appropriation Investment, Net 550,000,000   550,000,000     556,000,000    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (78,000,000)   (78,000,000)     (12,000,000)    
Total Proprietary Capital 12,206,000,000 $ 11,048,000,000 12,206,000,000 $ 11,048,000,000 $ 11,979,000,000 11,625,000,000 $ 10,919,000,000 $ 10,283,000,000
Net income (loss) 205,000,000 165,000,000 652,000,000 829,000,000        
Total other comprehensive income (loss) 24,000,000 (34,000,000) (66,000,000) (59,000,000)        
Return on power program appropriation investment (2,000,000) (2,000,000) (5,000,000) (5,000,000)        
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        
Power Program Retained Earnings                
Power Program Retained Earnings 11,476,000,000 10,234,000,000 11,476,000,000 10,234,000,000 11,271,000,000 10,823,000,000 10,069,000,000 9,404,000,000
Net income (loss) 207,000,000 167,000,000 658,000,000 835,000,000        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment (2,000,000) (2,000,000) (5,000,000) (5,000,000)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 550,000,000 558,000,000 550,000,000 558,000,000 552,000,000 556,000,000 560,000,000 564,000,000
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        
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 (78,000,000) (2,000,000) (78,000,000) (2,000,000) $ (102,000,000) $ (12,000,000) $ 32,000,000 $ 57,000,000
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss) 24,000,000 (34,000,000) (66,000,000) (59,000,000)        
Return on power program appropriation investment $ 0 $ 0 $ 0 $ 0