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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Balance at Beginning of Period | $ 5,103 | $ 5,094 | $ 5,326 | $ 5,229
Net income (loss) | 54 | (94) | (191) | (267)
Total other comprehensive income (loss) | 14 | (7) | 42 | 38
Return on power program appropriation investment | (2) | (1) | (3) | (3)
Return of power program appropriation investment | (5) | (5) | (10) | (10)
Balance at End of Period | 5,164 | 4,987 | 5,164 | 4,987
Power Program Appropriation Investment |  |  |  |
Balance at Beginning of Period | 283 | 303 | 288 | 308
Net income (loss) | 0 | 0 | 0 | 0
Total other comprehensive income (loss) | 0 |  | 0 | 0
Return on power program appropriation investment | 0 | 0 | 0 | 0
Return of power program appropriation investment | (5) | (5) | (10) | (10)
Balance at End of Period | 278 | 298 | 278 | 298
Power Program Retained Earnings |  |  |  |
Balance at Beginning of Period | 4,249 | 4,257 | 4,492 | 4,429
Net income (loss) | 55 | (92) | (187) | (262)
Total other comprehensive income (loss) | 0 |  | 0 | 0
Return on power program appropriation investment | (2) | (1) | (3) | (3)
Return of power program appropriation investment | 0 | 0 | 0 | 0
Balance at End of Period | 4,302 | 4,164 | 4,302 | 4,164
Nonpower Programs Appropriation Investment, Net |  |  |  |
Balance at Beginning of Period | 617 | 627 | 620 | 630
Net income (loss) | (1) | (2) | (4) | (5)
Total other comprehensive income (loss) | 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 | 616 | 625 | 616 | 625
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Balance at Beginning of Period | (46) | (93) | (74) | (138)
Net income (loss) | 0 | 0 | 0 | 0
Total other comprehensive income (loss) | 14 | (7) | 42 | 38
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 | $ (32) | $ (100) | $ (32) | $ (100)

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