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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Balance at Beginning of Period $ 4,987 $ 5,371 $ 5,229 $ 5,137
Net income (loss) (23) (240) (290) (35)
Other comprehensive income (loss)        
Net unrealized gain (loss) on future cash flow hedges (36) (12) 27 51
Reclassification to earnings from cash flow hedges 18 (1) (7) (21)
Total other comprehensive income (loss) (18) (13) 20 30
Return on power program appropriation investment (3) (1) (6) (5)
Return of power program appropriation investment (5) (5) (15) (15)
Balance at End of Period 4,938 5,112 4,938 5,112
Power Program Appropriation Investment
        
Balance at Beginning of Period 298 318 308 328
Net income (loss) 0 0 0 0
Other comprehensive income (loss)        
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 293 313 293 313
Power Program Retained Earnings
        
Balance at Beginning of Period 4,164 4,470 4,429 4,264
Net income (loss) (20) (239) (282) (29)
Other comprehensive income (loss)        
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 (3) (1) (6) (5)
Return of power program appropriation investment 0 0 0 0
Balance at End of Period 4,141 4,230 4,141 4,230
Nonpower Programs Appropriation Investment, Net
        
Balance at Beginning of Period 625 635 630 640
Net income (loss) (3) (1) (8) (6)
Other comprehensive income (loss)        
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 0 0 0
Balance at End of Period 622 634 622 634
Accumulated Other Comprehensive Income (Loss)
        
Balance at Beginning of Period (100) (52) (138) (95)
Net income (loss) 0 0 0 0
Other comprehensive income (loss)        
Net unrealized gain (loss) on future cash flow hedges (36) (12) 27 51
Reclassification to earnings from cash flow hedges 18 (1) (7) (21)
Total other comprehensive income (loss) (18) (13) 20 30
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 (118) (65) (118) (65)
Comprehensive Income (Loss)
        
Net income (loss) (23) (240) (290) (35)
Other comprehensive income (loss)        
Net unrealized gain (loss) on future cash flow hedges (36) (12) 27 51
Reclassification to earnings from cash flow hedges 18 (1) (7) (21)
Total other comprehensive income (loss) (18) (13) 20 30
Total comprehensive income (loss) $ (41) $ (253) $ (270) $ (5)