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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, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Balance at Beginning of Period | $ 5,164 | $ 4,987 | $ 5,326 | $ 5,229
Net income (loss) | (12) | (23) | (203) | (290)
Total other comprehensive income (loss) | 8 | (18) | 50 | 20
Return on power program appropriation investment | (1) | (3) | (4) | (6)
Return of power program appropriation investment | (5) | (5) | (15) | (15)
Balance at End of Period | 5,154 | 4,938 | 5,154 | 4,938
Power Program Appropriation Investment |  |  |  |
Balance at Beginning of Period | 278 | 298 | 288 | 308
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 | (5) | (5) | (15) | (15)
Balance at End of Period | 273 | 293 | 273 | 293
Power Program Retained Earnings |  |  |  |
Balance at Beginning of Period | 4,302 | 4,164 | 4,492 | 4,429
Net income (loss) | (9) | (20) | (196) | (282)
Total other comprehensive income (loss) | 0 | 0 | 0 | 0
Return on power program appropriation investment | (1) | (3) | (4) | (6)
Return of power program appropriation investment | 0 | 0 | 0 | 0
Balance at End of Period | 4,292 | 4,141 | 4,292 | 4,141
Nonpower Programs Appropriation Investment, Net |  |  |  |
Balance at Beginning of Period | 616 | 625 | 620 | 630
Net income (loss) | (3) | (3) | (7) | (8)
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 | 613 | 622 | 613 | 622
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Balance at Beginning of Period | (32) | (100) | (74) | (138)
Net income (loss) | 0 | 0 | 0 | 0
Total other comprehensive income (loss) | 8 | (18) | 50 | 20
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 | $ (24) | $ (118) | $ (24) | $ (118)

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