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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Balance at Beginning of Period $ 5,861 $ 5,164 $ 5,647 $ 5,326
Net income (loss) (81) (12) 147 (203)
Total other comprehensive income (loss) (25) 8 (32) 50
Return on power program appropriation investment (1) (1) (3) (4)
Return of power program appropriation investment (2) (5) (7) (15)
Balance at End of Period 5,752 5,154 5,752 5,154
Power Program Appropriation Investment
        
Balance at Beginning of Period 263 278 268 288
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 (2) (5) (7) (15)
Balance at End of Period 261 273 261 273
Power Program Retained Earnings
        
Balance at Beginning of Period 4,997 4,302 4,767 4,492
Net income (loss) (79) (9) 153 (196)
Total other comprehensive income (loss) 0 0 0 0
Return on power program appropriation investment (1) (1) (3) (4)
Return of power program appropriation investment 0 0 0 0
Balance at End of Period 4,917 4,292 4,917 4,292
Nonpower Programs Appropriation Investment, Net
        
Balance at Beginning of Period 605 616 609 620
Net income (loss) (2) (3) (6) (7)
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 603 613 603 613
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges
        
Balance at Beginning of Period (4) (32) 3 (74)
Net income (loss) 0 0 0 0
Total other comprehensive income (loss) (25) 8 (32) 50
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 $ (29) $ (24) $ (29) $ (24)