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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Balance at beginning of year $ 5,326 $ 5,229 $ 5,137
Net income (loss) 271 60 162
Total other comprehensive income (loss) 77 64 (43)
Return on power program appropriation investment (7) (7) (7)
Return of power program appropriation investment (20) (20) (20)
Balance at end of year 5,647 5,326 5,229
Power Program Appropriation Investment
      
Balance at beginning of year 288 308 328
Net income (loss) 0 0 0
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment 0 0 0
Return of power program appropriation investment (20) (20) (20)
Balance at end of year 268 288 308
Power Program Retained Earnings
      
Balance at beginning of year 4,492 4,429 4,264
Net income (loss) 282 70 172
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment (7) (7) (7)
Return of power program appropriation investment 0 0 0
Balance at end of year 4,767 4,492 4,429
Nonpower Programs Appropriation Investment, Net
      
Balance at beginning of year 620 630 640
Net income (loss) (11) (10) (10)
Total other comprehensive income (loss) 0 0 0
Return on power program appropriation investment 0 0 0
Return of power program appropriation investment 0 0 0
Balance at end of year 609 620 630
Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges
      
Balance at beginning of year (74) (138) (95)
Net income (loss) 0 0 0
Total other comprehensive income (loss) 77 64 (43)
Return on power program appropriation investment 0 0 0
Return of power program appropriation investment 0 0 0
Balance at end of year $ 3 $ (74) $ (138)