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Nonconsolidated Partially-Owned Affiliates (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]      
Gross Profit $ 8,059 $ 7,411 $ 7,693
Net income $ 1,870 $ 795 $ 5,887
Percentage of results of operations     100.00%
Equity Method Investment, Nonconsolidated Investees      
Schedule of Equity Method Investments [Line Items]      
Revenues     $ 3,882
Gross Profit     1,070
Net income     411
Income attributable to noncontrolling interests     13
Net income attributable to the entity     $ 398