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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Balance at Beginning of Period $ 6,687 $ 5,861 $ 6,104 $ 5,647
Net income (loss) 32 (81) 609 147
Total other comprehensive income (loss) 9 (25) 19 (32)
Return on power program appropriation investment (1) (1) (5) (3)
Return of power program appropriation investment   (2)   (7)
Balance at End of Period 6,727 5,752 6,727 5,752
Power Program Appropriation Investment        
Balance at Beginning of Period 258 263 258 268
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)   (7)
Balance at End of Period 258 261 258 261
Power Program Retained Earnings        
Balance at Beginning of Period 5,819 4,997 5,240 4,767
Net income (loss) 34 (79) 617 153
Total other comprehensive income (loss) 0 0 0 0
Return on power program appropriation investment (1) (1) (5) (3)
Return of power program appropriation investment   0   0
Balance at End of Period 5,852 4,917 5,852 4,917
Nonpower Programs Appropriation Investment, Net        
Balance at Beginning of Period 595 605 601 609
Net income (loss) (2) (2) (8) (6)
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
Balance at End of Period 593 603 593 603
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges        
Balance at Beginning of Period 15 (4) 5 3
Net income (loss) 0 0 0 0
Total other comprehensive income (loss) 9 (25) 19 (32)
Return on power program appropriation investment 0 0 0 0
Return of power program appropriation investment   0   0
Balance at End of Period $ 24 $ (29) $ 24 $ (29)