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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Balance at beginning of year $ 15,505 $ 14,465 $ 12,932
Net income (loss) 500 1,108 1,512
Total other comprehensive income (loss) 57 (64) 29
Return on power program appropriation investment (6) (4) (4)
Balance at end of year 16,056 15,505 14,465
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 14,800 13,689 12,177
Net income (loss) 508 1,115 1,520
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment (6) (4) (4)
New Accounting Standard - CECL     (4)
Balance at end of year 15,302 14,800 13,689
Nonpower Programs Appropriation Investment, Net      
Balance at beginning of year 533 540 548
Net income (loss) (8) (7) (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 525 533 540
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges      
Balance at beginning of year (86) (22) (51)
Net income (loss) 0 0 0
Total other comprehensive income (loss) 57 (64) 29
Return on power program appropriation investment 0 0 0
New Accounting Standard - CECL     0
Balance at end of year $ (29) $ (86) $ (22)