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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Balance at Beginning of Period | $ 5,647 | $ 5,326
Net income (loss) | (67) | (245)
Total other comprehensive income (loss) | (2) | 28
Return on power program appropriation investment | (1) | (1)
Return of power program appropriation investment | (3) | (5)
Balance at End of Period | 5,574 | 5,103
Power Program Appropriation Investment |  |
Balance at Beginning of Period | 268 | 288
Net income (loss) | 0 | 0
Total other comprehensive income (loss) | 0 | 0
Return on power program appropriation investment | 0 | 0
Return of power program appropriation investment | (3) | (5)
Balance at End of Period | 265 | 283
Power Program Retained Earnings |  |
Balance at Beginning of Period | 4,767 | 4,492
Net income (loss) | (65) | (242)
Total other comprehensive income (loss) | 0 | 0
Return on power program appropriation investment | (1) | (1)
Return of power program appropriation investment | 0 | 0
Balance at End of Period | 4,701 | 4,249
Nonpower Programs Appropriation Investment, Net |  |
Balance at Beginning of Period | 609 | 620
Net income (loss) | (2) | (3)
Total other comprehensive income (loss) | 0 | 0
Return on power program appropriation investment | 0 | 0
Return of power program appropriation investment | 0 | 0
Balance at End of Period | 607 | 617
Accumulated Other Comprehensive Income (Loss) |  |
Balance at Beginning of Period | 3 | (74)
Net income (loss) | 0 | 0
Total other comprehensive income (loss) | (2) | 28
Return on power program appropriation investment | 0 | 0
Return of power program appropriation investment | 0 | 0
Balance at End of Period | $ 1 | $ (46)

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 + Details
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