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Related Parties Related Parties (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Related Parties |  |  |
Amount of appropriations currently received | $ 0 |  |
Amount of appropriation investment that must be repaid | 1,000,000,000 |  |
Current borrowing capacity | 150,000,000 |  |
Sales of electricity | 128,000,000 | 120,000,000 | 117,000,000
Other income | 137,000,000 | 102,000,000 | 164,000,000
Operating and maintenance | 286,000,000 | 314,000,000 | 375,000,000
Cash and cash equivalents | 35,000,000 | 38,000,000 | 32,000,000
Accounts receivable, net | 85,000,000 | 58,000,000 | 49,000,000
Accounts payable and accrued liabilities | 146,000,000 | 133,000,000 | 204,000,000
Long-term power bonds, net | 3,000,000 | 0 | 0
Return on power program appropriation investment | 4,000,000 | 7,000,000 | 7,000,000
Return of power program appropriation investment | $ 10,000,000 | $ 20,000,000 | $ 20,000,000

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of other forms of uncollateralized debt obligations not elsewhere specified in the taxonomy(with maturities initially due after one year or beyond the operating cycle if longer). + 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 of the government's appropriation investment in the reporting entity. + 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 Amounts payable to customers at the balance sheet date. The term customers generally excludes other broker-dealers; persons who are principal officers, directors, and stockholders; and persons whose securities or funds are part of the regulatory net capital of the broker-dealer. Another broker-dealer's account can be classified as a customer if the account is carried as an omnibus account in compliance with certain regulations. The accounts of principal officers, directors and stockholders may be combined in the customer captions if they are not material and the combination is disclosed in the oath that is required to accompany the annual audited FOCUS Report. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Article 15c3 -Subsection c + Details
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