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Financial Statements - Carrying Amounts and Classification of Assets and Liabilities for Consolidated VIEs (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Current assets | $ 13,962 | $ 17,109
Current liabilities | 11,515 | 16,331
Long-term liabilities | 18,367 | 21,524
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Current assets | 2 | 284
Noncurrent assets | 53 | 98
Total assets | 55 | 382
Current liabilities | 4 | 230
Long-term liabilities | 43 | 29
Total liabilities | $ 47 | $ 259

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