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Related Parties Related Parties (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Related Parties |  |  |
Unpaid appropriation investment | $ 10 |  |
Current borrowing capacity | 150 |  |
Sales of electricity | 120 | 117 | 130
Other income | 102 | 164 | 104
Operating and maintenance | 314 | 375 | 295
Cash and cash equivalents | 38 | 32 | 27
Accounts receivable, net | 58 | 49 | 84
Accounts payable and accrued liabilities | 133 | 204 | 175
Return on power program appropriation investment | 7 | 7 | 7
Return of power program appropriation investment | $ 20 | $ 20 | $ 20

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- Definition This element represents disclosure of the cash payments from net power proceeds paid annually to the U.S. government as a return of the government's appropriation investment in the reporting entity. + References No definition available. + Details
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- Definition This element represents disclosure of the cash payments from net power proceeds paid annually to the U.S. government as a return on the government's appropriation investment in the reporting entity. + References No definition available. + Details
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- Definition The remaining unpaid appropriation investment. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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