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Related Parties Related Parties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Related Parties |  |  |
Amount of appropriations currently received | $ 0 |  |
Amount of appropriation investment that must be repaid | 1,000 |  |
Current borrowing capacity | 150 |  |
Return on power program appropriation investment | 5 | $ 4 | $ 7
Return of power program appropriation investment |  | 10 | 20
Related Party Transactions |  |  |
Related Parties |  |  |
Sales of electricity | 130 | 128 | 120
Other income | 115 | 120 | 84
Judgment settlement | 52 | 17 | 18
Operating expenses | 227 | 267 | 299
Additions to property, plant, and equipment | 37 | 19 | 15
Cash and cash equivalents | 45 | 35 | 38
Accounts receivable, net | 106 | 85 | 58
Accounts payable and accrued liabilities | 98 | 146 | 133
Long-term power bonds, net | 5 | 3 | 0
Return on power program appropriation investment | 5 | 4 | 7
Return of power program appropriation investment | $ 0 | $ 10 | $ 20

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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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