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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Balance at beginning of year $ 14,465 $ 12,932 $ 11,625
Net income (loss) 1,108 1,512 1,352
Total other comprehensive income (loss) (64) 29 (39)
Return on power program appropriation investment (4) (4) (6)
Balance at end of year 15,505 14,465 12,932
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 13,689 12,177 10,823
Net income (loss) 1,115 1,520 1,360
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment (4) (4) (6)
New Accounting Standard - CECL   (4)  
Balance at end of year 14,800 13,689 12,177
Nonpower Programs Appropriation Investment, Net      
Balance at beginning of year 540 548 556
Net income (loss) (7) (8) (8)
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 533 540 548
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges      
Balance at beginning of year (22) (51) (12)
Net income (loss) 0 0 0
Total other comprehensive income (loss) (64) 29 (39)
Return on power program appropriation investment 0 0 0
New Accounting Standard - CECL   0  
Balance at end of year $ (86) $ (22) $ (51)