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Nonconsolidated Partially-Owned Affiliates (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]        
Assets, Current $ 10,053 $ 12,393    
Total assets 40,815 42,287 $ 48,797  
Liabilities, Current 8,248 9,070    
Liabilities, Noncurrent 14,034 12,388    
Noncontrolling interests 1,086 1,063    
Stockholders' Equity Attributable to Parent 17,447 19,766 21,164 $ 20,447
Liabilities and Equity 40,815 42,287    
Gross Profit 7,411 7,693 7,667  
Net income $ 795 $ 5,887 2,383  
Percentage of results of operations   100.00%    
Equity Method Investment, Nonconsolidated Investees        
Schedule of Equity Method Investments [Line Items]        
Assets, Current   $ 2,941    
Assets, Noncurrent   1,020    
Total assets   3,961    
Liabilities, Current   2,135    
Liabilities, Noncurrent   157    
Noncontrolling interests   67    
Stockholders' Equity Attributable to Parent   1,602    
Liabilities and Equity   3,961    
Revenues   3,882 3,974  
Gross Profit   1,070 1,049  
Net income   411 390  
Income attributable to noncontrolling interests   13 10  
Net income attributable to the entity   $ 398 $ 380