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STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (Unaudited) (USD $)
In Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Balance at Beginning of Period $ 5,371 $ 4,853 $ 5,137 $ 4,218
Net income (loss) (240) 199 (35) 779
Net unrealized gain (loss) on future cash flow hedges (12) (76) 51 (55)
Reclassification to earnings from cash flow hedges (1) 14 (21) 63
Total other comprehensive income (loss) (13) (62) 30 8
Return on power program appropriation investment (1) (2) (5) (7)
Return of power program appropriation investment (5) (8) (15) (18)
Balance at End of Period 5,112 4,980 5,112 4,980
Power Program Appropriation Investment
        
Balance at Beginning of Period 318 338 328 348
Net income (loss) 0 0 0 0
Net unrealized gain (loss) on future cash flow hedges 0 0 0 0
Reclassification to earnings from cash flow hedges 0 0 0 0
Total other comprehensive income (loss) 0 0 0 0
Return on power program appropriation investment 0 0 0 0
Return of power program appropriation investment (5) (5) (15) (15)
Balance at End of Period 313 333 313 333
Power Program Retained Earnings
        
Balance at Beginning of Period 4,470 3,871 4,264 3,291
Net income (loss) (239) 202 (29) 787
Net unrealized gain (loss) on future cash flow hedges 0 0 0 0
Reclassification to earnings from cash flow hedges 0 0 0 0
Total other comprehensive income (loss) 0 0 0 0
Return on power program appropriation investment (1) (2) (5) (7)
Return of power program appropriation investment 0 0 0 0
Balance at End of Period 4,230 4,071 4,230 4,071
Nonpower Programs Appropriation Investment Net
        
Balance at Beginning of Period 635 649 640 654
Net income (loss) (1) (3) (6) (8)
Net unrealized gain (loss) on future cash flow hedges 0 0 0 0
Reclassification to earnings from cash flow hedges 0 0 0 0
Total other comprehensive income (loss) 0 0 0 0
Return on power program appropriation investment 0 0 0 0
Return of power program appropriation investment 0 (3) 0 (3)
Balance at End of Period 634 643 634 643
Accumulated Other Comprehensive Income (Loss)
        
Balance at Beginning of Period (52) (5) (95) (75)
Net income (loss) 0 0 0 0
Net unrealized gain (loss) on future cash flow hedges (12) (76) 51 (55)
Reclassification to earnings from cash flow hedges (1) 14 (21) 63
Total other comprehensive income (loss) (13) (62) 30 8
Return on power program appropriation investment 0 0 0 0
Return of power program appropriation investment 0 0 0 0
Balance at End of Period (65) (67) (65) (67)
Comprehensive Income (Loss)
        
Net income (loss) (240) 199 (35) 779
Net unrealized gain (loss) on future cash flow hedges (12) (76) 51 (55)
Reclassification to earnings from cash flow hedges (1) 14 (21) 63
Total other comprehensive income (loss) (13) (62) 30 8
Total comprehensive income (loss) $ (253) $ 137 $ (5) $ 787