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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000  
Power Program Retained Earnings 13,701,000,000   13,689,000,000  
Nonpower Programs Appropriation Investment, Net 538,000,000   540,000,000  
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (18,000,000)   (22,000,000)  
Total Proprietary Capital 14,479,000,000 $ 13,167,000,000 14,465,000,000 $ 12,932,000,000
Net income (loss) 11,000,000 184,000,000    
Total other comprehensive income (loss) 4,000,000 56,000,000    
Return on power program appropriation investment (1,000,000) (1,000,000)    
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 13,701,000,000 12,358,000,000 13,689,000,000 12,177,000,000
Net income (loss) 13,000,000 186,000,000    
Total other comprehensive income (loss) 0 0    
Return on power program appropriation investment (1,000,000) (1,000,000)    
New Accounting Standard - CECL   (4,000,000)    
Nonpower Programs Appropriation Investment, Net        
Nonpower Programs Appropriation Investment, Net 538,000,000 546,000,000 540,000,000 548,000,000
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 (18,000,000) 5,000,000 $ (22,000,000) $ (51,000,000)
Net income (loss) 0 0    
Total other comprehensive income (loss) 4,000,000 56,000,000    
Return on power program appropriation investment $ 0 0    
New Accounting Standard - CECL   $ 0