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Note 16. Income Taxes Components of the Provision (Benefit) for Income Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Deferred Tax Asset [Domain]      
Operating Loss Carryforwards [Line Items]      
Income (Loss) from Continuing Operations before Income Taxes, Foreign $ (63) $ (277) $ 38
Federal Income Tax Expense (Benefit), Continuing Operations (2) 0 0
Deferred Foreign Income Tax Expense (Benefit) 13 (295) (89)
Deferred Federal Income Tax Expense (Benefit) (52) (572) (51)
Other Current Assets [Member]      
Operating Loss Carryforwards [Line Items]      
Income (Loss) from Continuing Operations before Income Taxes, Domestic 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Foreign 14 1,548 268
Foreign Income Tax Expense (Benefit), Continuing Operations 137 863 201
Current Federal Tax Expense (Benefit) $ 151 $ 2,411 $ 469