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Income Taxes Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Deferred tax assets |  |
Accrued expenses and reserves | $ 407 | $ 474
Employee and retiree benefits | 148 | 286
Property, plant and equipment | 369 | 182
Net operating loss and other credit carryforwards | 6,293 | 6,306
Research and development | 42 | 112
Operating lease liabilities | 334 | 304
Other, net | 28 | 99
Gross deferred tax assets | 7,621 | 7,763
Valuation allowances | (5,853) | (5,518)
Net deferred tax assets | 1,768 | 2,245
Deferred tax liabilities |  |
Joint ventures and partnerships | 346 | 730
Intangible assets | 776 | 734
Operating lease right-of-use asset | 334 | 304
Deferred Tax Liabilities, Gross | 1,456 | 1,768
Deferred Tax Assets (Liabilities), Net | 312 | $ 477
Operating Loss Carryforwards | 23,700 |
Net Operating Loss Carry Forwards That Will Expire | 13,200 |
Tax Credit Carryforward, Amount | $ 35 |

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