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Income Taxes - Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Deferred tax assets    
Accrued expenses and reserves $ 376 $ 407
Employee and retiree benefits 77 148
Property, plant and equipment 444 369
Net operating loss and other credit carryforwards 6,472 6,293
Research and development 52 42
Operating lease liabilities 309 334
Other, net 58 28
Gross deferred tax assets 7,788 7,621
Valuation allowances (5,967) (5,853)
Net deferred tax assets 1,821 1,768
Deferred tax liabilities    
Subsidiaries, joint ventures and partnerships 338 346
Intangible assets 730 776
Operating lease right-of-use assets 309 334
Gross deferred tax liabilities 1,377 1,456
Net deferred tax asset $ 444 $ 312