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Note 16. Income Taxes US Federal Income Tax Rate Rec (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount   $ 136 $ 336
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount   0 15
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount $ (67) (92) (13)
Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount   (207) (252)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount   7 6
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount   1,988 356
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   14 (13)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount   7 (5)
Income Tax Expense (Benefit) $ 99 $ 1,839 $ 418