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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