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Income Taxes - Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Deferred tax assets        
Accrued expenses and reserves $ 424 $ 661    
Employee and retiree benefits 38 43    
Property, plant and equipment 522 729    
Net operating loss and other credit carryforwards 6,963 6,628    
Research and development 233 219    
Intangible assets 137 306    
Operating lease liabilities 327 294    
Other, net 315 455    
Gross deferred tax assets 8,959 9,335    
Valuation allowances (6,256) (6,258) $ (6,279) $ (5,906)
Net deferred tax assets 2,703 3,077    
Deferred tax liabilities        
Subsidiaries, joint ventures and partnerships 193 440    
Operating lease right-of-use assets 327 294    
Other liabilities 591 675    
Gross deferred tax liabilities 1,111 1,409    
Net deferred tax asset $ 1,592 $ 1,668