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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Balance at beginning of year $ 12,932 $ 11,625 $ 10,283
Net income (loss) 1,512 1,352 1,417
Total other comprehensive income (loss) 29 (39) (69)
Return on power program appropriation investment (4) (6) (6)
New Accounting Standard - CECL (4)    
Balance at end of year 14,465 12,932 11,625
Power Program Appropriation Investment      
Balance at beginning of year 258 258 258
Net income (loss) 0 0 0
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment 0 0 0
New Accounting Standard - CECL 0    
Balance at end of year 258 258 258
Power Program Retained Earnings      
Balance at beginning of year 12,177 10,823 9,404
Net income (loss) 1,520 1,360 1,425
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment (4) (6) (6)
New Accounting Standard - CECL (4) 0  
Balance at end of year 13,689 12,177 10,823
Nonpower Programs Appropriation Investment, Net      
Balance at beginning of year 548 556 564
Net income (loss) (8) (8) (8)
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment 0 0 0
New Accounting Standard - CECL 0 0  
Balance at end of year 540 548 556
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges      
Balance at beginning of year (51) (12) 57
Net income (loss) 0 0 0
Total other comprehensive income (loss) 29 (39) (69)
Return on power program appropriation investment 0 0 0
New Accounting Standard - CECL 0    
Balance at end of year $ (22) $ (51) $ (12)