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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Balance at Beginning of Period $ 5,103 $ 5,094 $ 5,326 $ 5,229
Net income (loss) 54 (94) (191) (267)
Total other comprehensive income (loss) 14 (7) 42 38
Return on power program appropriation investment (2) (1) (3) (3)
Return of power program appropriation investment (5) (5) (10) (10)
Balance at End of Period 5,164 4,987 5,164 4,987
Power Program Appropriation Investment
        
Balance at Beginning of Period 283 303 288 308
Net income (loss) 0 0 0 0
Total other comprehensive income (loss) 0    0 0
Return on power program appropriation investment 0 0 0 0
Return of power program appropriation investment (5) (5) (10) (10)
Balance at End of Period 278 298 278 298
Power Program Retained Earnings
        
Balance at Beginning of Period 4,249 4,257 4,492 4,429
Net income (loss) 55 (92) (187) (262)
Total other comprehensive income (loss) 0    0 0
Return on power program appropriation investment (2) (1) (3) (3)
Return of power program appropriation investment 0 0 0 0
Balance at End of Period 4,302 4,164 4,302 4,164
Nonpower Programs Appropriation Investment, Net
        
Balance at Beginning of Period 617 627 620 630
Net income (loss) (1) (2) (4) (5)
Total other comprehensive income (loss) 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 616 625 616 625
Accumulated Other Comprehensive Income (Loss)
        
Balance at Beginning of Period (46) (93) (74) (138)
Net income (loss) 0 0 0 0
Total other comprehensive income (loss) 14 (7) 42 38
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 $ (32) $ (100) $ (32) $ (100)