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Nonconsolidated Partially-Owned Affiliates Summarized Income Statement Data (Detail) - Equity Method Investments - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Equity Method Investments, Summarized Income Statement Information [Line Items]      
Net sales $ 3,882 $ 3,974 $ 3,113
Gross profit 1,070 1,049 855
Net income 411 390 347
Income attributable to noncontrolling interests 13 10 11
Net income attributable to the entity $ 398 $ 380 $ 336