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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Balance at Beginning of Period $ 5,647 $ 5,326
Net income (loss) (67) (245)
Total other comprehensive income (loss) (2) 28
Return on power program appropriation investment (1) (1)
Return of power program appropriation investment (3) (5)
Balance at End of Period 5,574 5,103
Power Program Appropriation Investment
    
Balance at Beginning of Period 268 288
Net income (loss) 0 0
Total other comprehensive income (loss) 0 0
Return on power program appropriation investment 0 0
Return of power program appropriation investment (3) (5)
Balance at End of Period 265 283
Power Program Retained Earnings
    
Balance at Beginning of Period 4,767 4,492
Net income (loss) (65) (242)
Total other comprehensive income (loss) 0 0
Return on power program appropriation investment (1) (1)
Return of power program appropriation investment 0 0
Balance at End of Period 4,701 4,249
Nonpower Programs Appropriation Investment, Net
    
Balance at Beginning of Period 609 620
Net income (loss) (2) (3)
Total other comprehensive income (loss) 0 0
Return on power program appropriation investment 0 0
Return of power program appropriation investment 0 0
Balance at End of Period 607 617
Accumulated Other Comprehensive Income (Loss)
    
Balance at Beginning of Period 3 (74)
Net income (loss) 0 0
Total other comprehensive income (loss) (2) 28
Return on power program appropriation investment 0 0
Return of power program appropriation investment 0 0
Balance at End of Period $ 1 $ (46)