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Income Taxes - Temporary Differences and Carryforwards (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]    
Accrued expenses and reserves $ 115 $ 73
Employee and retiree benefits 53 43
Net operating loss and other credit carryforwards 1,072 751
Property, plant and equipment 163 161
Intangible assets 257 308
Operating lease liabilities 80 0
Foreign currency adjustments 17 2
Research and development 20 16
Other 3 5
Deferred tax assets: 1,780 1,359
Valuation allowances (1,656) (1,304)
Deferred tax assets, net 124 55
Unremitted earnings of foreign subsidiaries 41 62
Operating lease right-of-use assets 80 0
Deferred tax liabilities: 121 62
Net deferred tax asset/(liability) $ 3  
Net deferred tax liabilities   $ (7)