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Financial Statements - Carrying Amounts and Classification of Assets and Liabilities for Consolidated VIEs (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Current assets | $ 12,429 | $ 12,292
Current liabilities | 11,246 | 11,854
Long-term liabilities | $ 16,795 | 18,452
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Current assets |  | 2
Noncurrent assets |  | 53
Total assets |  | 55
Current liabilities |  | 6
Long-term liabilities |  | 42
Total liabilities |  | $ 48

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