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Income Taxes Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Deferred tax assets    
Accrued expenses and reserves $ 437 $ 458
Employee and retiree benefits 265 178
Net operating loss and other credit carryforwards 5,664 6,350
Research and development 106 93
Gross deferred tax assets 6,472 7,079
Valuation allowances (5,068) (5,088)
Net deferred tax assets 1,404 1,991
Deferred tax liabilities    
Property, plant and equipment 139 179
Joint ventures and partnerships 499 283
Intangible assets 759 915
Other, net 43 76
Deferred Tax Liabilities, Gross 1,440 1,453
Deferred Tax Liabilities, Net (36)  
Net deferred tax asset   $ 538
Deferred Tax Expense from Stock Options Exercised $ 179