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Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
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Prepaid Expenses and Other Assets [Abstract] |  |
Prepaid operating expenses and maintenance | $ 151 | $ 137
Income tax receivable (See Note 19—Income Taxes) | 232 | 77
Foreign exchange derivative instruments (See Note 12—Derivative Financial Instruments) | 50 | 76
Other | 122 | 63
Total | $ 555 | $ 353

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- Definition Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + 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 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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