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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000  
Power Program Retained Earnings 12,358,000,000   12,177,000,000  
Nonpower Programs Appropriation Investment, Net 546,000,000   548,000,000  
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges 5,000,000   (51,000,000)  
Total Proprietary Capital 13,167,000,000 $ 11,832,000,000 12,932,000,000 $ 11,625,000,000
Net income (loss) 184,000,000 192,000,000    
Total other comprehensive income (loss) 56,000,000 17,000,000    
Return on power program appropriation investment (1,000,000) (2,000,000)    
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
Net income (loss) 0 0    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment 0 0    
New Accounting Standard - CECL 0      
Power Program Retained Earnings        
Power Program Retained Earnings 12,358,000,000 11,015,000,000 12,177,000,000 10,823,000,000
Net income (loss) 186,000,000 194,000,000    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment (1,000,000) (2,000,000)    
New Accounting Standard - CECL (4,000,000)      
Nonpower Programs Appropriation Investment, Net        
Nonpower Programs Appropriation Investment, Net 546,000,000 554,000,000 548,000,000 556,000,000
Net income (loss) (2,000,000) (2,000,000)    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment 0 0    
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 5,000,000 5,000,000 $ (51,000,000) $ (12,000,000)
Net income (loss) 0 0    
Total other comprehensive income (loss) 56,000,000 17,000,000    
Return on power program appropriation investment 0 $ 0    
New Accounting Standard - CECL $ 0