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Summary of Significant Accounting Policies Carrying Amounts and Classification of Assets and Liabilities for Consolidated VIE's (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Current assets | $ 12,292 | $ 17,109 |
Total assets | 51,884 | 63,179 | $ 29,590
Liabilities, Current | 11,854 | 16,331 |
Long-term liabilities | 18,452 | 21,524 |
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Current assets | 2 | 284 |
Assets, Noncurrent | 53 | 98 |
Total assets | 55 | 382 |
Liabilities, Current | 6 | 230 |
Long-term liabilities | 42 | 29 |
Liabilities | $ 48 | $ 259 |

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