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Nonconsolidated Partially-Owned Affiliates Summarized Balance Sheet Data (Detail) - Equity Method Investments - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Equity Method Investments, Summarized Balance Sheet Information [Line Items]
Current Assets	$ 2,941	$ 3,134
Noncurrent assets	1,020	804
Total assets	3,961	3,938
Current liabilities	2,135	2,111
Noncurrent liabilities	157	150
Noncontrolling interests	67	39
Shareholders' equity	1,602	1,638
Total liabilities and shareholders' equity	$ 3,961	$ 3,938

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