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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Balance at Beginning of Period $ 5,326 $ 5,229
Net income (loss) (245) (173)
Total other comprehensive income (loss) 28 45
Return on power program appropriation investment (1) (2)
Return of power program appropriation investment (5) (5)
Balance at End of Period 5,103 5,094
Power Program Appropriation Investment
    
Balance at Beginning of Period 288 308
Net income (loss) 0 0
Total other comprehensive income (loss) 0   
Return on power program appropriation investment 0 0
Return of power program appropriation investment (5) (5)
Balance at End of Period 283 303
Power Program Retained Earnings
    
Balance at Beginning of Period 4,492 4,429
Net income (loss) (242) (170)
Total other comprehensive income (loss) 0   
Return on power program appropriation investment (1) (2)
Return of power program appropriation investment 0 0
Balance at End of Period 4,249 4,257
Nonpower Programs Appropriation Investment, Net
    
Balance at Beginning of Period 620 630
Net income (loss) (3) (3)
Total other comprehensive income (loss) 0   
Return on power program appropriation investment 0 0
Return of power program appropriation investment 0 0
Balance at End of Period 617 627
Accumulated Other Comprehensive Income (Loss)
    
Balance at Beginning of Period (74) (138)
Net income (loss) 0 0
Total other comprehensive income (loss) 28 45
Return on power program appropriation investment 0 0
Return of power program appropriation investment 0 0
Balance at End of Period $ (46) $ (93)