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Note 16. Income Taxes Temporary Differences (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent $ 83 $ 431
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits 58 95
Deferred Tax Assets, Operating Loss Carryforwards 340 288
Deferred Tax Assets, Property, Plant and Equipment 3 0
Deferred Tax Assets, Goodwill and Intangible Assets 463 0
Deferred Tax Assets, in Process Research and Development 9 9
Deferred Tax Assets, Investment in Subsidiaries 0 265
Deferred Tax Assets, Other 13 11
Deferred Tax Assets, Gross 969 1,099
Deferred Tax Assets, Valuation Allowance 223 267
Deferred Tax Assets, Net 746 832
Deferred Tax Liabilities, Property, Plant and Equipment 0 23
Deferred Tax Liabilities, Undistributed Foreign Earnings 95 108
Deferred Tax Liabilities, Intangible Assets 0 110
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates 15 0
Deferred Tax Liabilities, Gross 110 241
Deferred Tax Liabilities, Net $ 636 $ 591