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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, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Current assets | $ 11,823 | $ 12,292 |
Total assets | 48,797 | 51,884 | $ 63,179
Liabilities, Current | 11,250 | 11,854 |
Long-term liabilities | $ 15,089 | 18,452 |
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Current assets |  | 2 |
Assets, Noncurrent |  | 53 |
Total assets |  | 55 |
Liabilities, Current |  | 6 |
Long-term liabilities |  | 42 |
Liabilities |  | $ 48 |

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