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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Balance at Beginning of Period $ 5,164 $ 4,987 $ 5,326 $ 5,229
Net income (loss) (12) (23) (203) (290)
Total other comprehensive income (loss) 8 (18) 50 20
Return on power program appropriation investment (1) (3) (4) (6)
Return of power program appropriation investment (5) (5) (15) (15)
Balance at End of Period 5,154 4,938 5,154 4,938
Power Program Appropriation Investment
        
Balance at Beginning of Period 278 298 288 308
Net income (loss) 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 273 293 273 293
Power Program Retained Earnings
        
Balance at Beginning of Period 4,302 4,164 4,492 4,429
Net income (loss) (9) (20) (196) (282)
Total other comprehensive income (loss) 0 0 0 0
Return on power program appropriation investment (1) (3) (4) (6)
Return of power program appropriation investment 0 0 0 0
Balance at End of Period 4,292 4,141 4,292 4,141
Nonpower Programs Appropriation Investment, Net
        
Balance at Beginning of Period 616 625 620 630
Net income (loss) (3) (3) (7) (8)
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 613 622 613 622
Accumulated Other Comprehensive Income (Loss)
        
Balance at Beginning of Period (32) (100) (74) (138)
Net income (loss) 0 0 0 0
Total other comprehensive income (loss) 8 (18) 50 20
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 $ (24) $ (118) $ (24) $ (118)