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Related Parties Related Parties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Related Parties |  |  |
Amount of appropriations currently received | $ 0 |  |
Amount of appropriation investment that was repaid | 1,000 |  |
Current borrowing capacity | 150 |  |
Return on power program appropriation investment | (6) | $ (5) | $ (4)
Return of power program appropriation investment |  |  | 10
Related Party Transactions |  |  |
Related Parties |  |  |
Sales of electricity | 126 | 130 | 128
Other income | 161 | 167 | 137
Operating expenses | 216 | 227 | 267
Additions to property, plant, and equipment | 32 | 37 | 19
Cash and cash equivalents | 54 | 45 | 35
Accounts receivable, net | 129 | 106 | 85
Accounts payable and accrued liabilities | 77 | 98 | 146
Long-term power bonds, net | 4 | 5 | 3
Return on power program appropriation investment | (6) | (5) | (4)
Return of power program appropriation investment | $ 0 | $ 0 | $ 10

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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 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 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 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=65884687&loc=d3e4428-111522 + Details
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