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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Power Program Appropriation Investment $ 258,000,000   $ 258,000,000     $ 258,000,000    
Power Program Retained Earnings 13,910,000,000   13,910,000,000     13,689,000,000    
Nonpower Programs Appropriation Investment, Net 537,000,000   537,000,000     540,000,000    
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges (16,000,000)   (16,000,000)     (22,000,000)    
Total Proprietary Capital 14,689,000,000 $ 13,639,000,000 14,689,000,000 $ 13,639,000,000 $ 14,479,000,000 14,465,000,000 $ 13,167,000,000 $ 12,932,000,000
Net income (loss) 209,000,000 456,000,000 220,000,000 640,000,000        
Total other comprehensive income (loss) 2,000,000 17,000,000 6,000,000 73,000,000        
Return on power program appropriation investment (1,000,000) (1,000,000) (2,000,000) (2,000,000)        
New Accounting Standard - CECL       (4,000,000)        
Power Program Appropriation Investment                
Power Program Appropriation Investment 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000 258,000,000
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 13,910,000,000 12,815,000,000 13,910,000,000 12,815,000,000 13,701,000,000 13,689,000,000 12,358,000,000 12,177,000,000
Net income (loss) 210,000,000 458,000,000 223,000,000 644,000,000        
Total other comprehensive income (loss) 0 0 0 0        
Return on power program appropriation investment (1,000,000) (1,000,000) (2,000,000) (2,000,000)        
New Accounting Standard - CECL       (4,000,000)        
Nonpower Programs Appropriation Investment, Net                
Nonpower Programs Appropriation Investment, Net 537,000,000 544,000,000 537,000,000 544,000,000 538,000,000 540,000,000 546,000,000 548,000,000
Net income (loss) (1,000,000) (2,000,000) (3,000,000) (4,000,000)        
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 (16,000,000) 22,000,000 (16,000,000) 22,000,000 $ (18,000,000) $ (22,000,000) $ 5,000,000 $ (51,000,000)
Net income (loss) 0 0 0 0        
Total other comprehensive income (loss) 2,000,000 17,000,000 6,000,000 73,000,000        
Return on power program appropriation investment $ 0 $ 0 $ 0 0        
New Accounting Standard - CECL       $ 0