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Nonconsolidated Partially-Owned Affiliates Summarized Balance Sheet Data (Detail) - Equity Method Investments - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Equity Method Investments, Summarized Balance Sheet Information [Line Items]    
Current Assets $ 4,034 $ 3,085
Noncurrent assets 1,513 1,436
Total assets 5,547 4,521
Current liabilities 2,470 1,864
Noncurrent liabilities 478 554
Noncontrolling interests 33 41
Shareholders' equity 2,566 2,062
Total liabilities and shareholders' equity $ 5,547 $ 4,521