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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