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Note 12. Equity and Noncontrolling Interests Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Redeemable Noncontrolling Interest [Line Items]      
Redeemable Noncontrolling Interest Beginning Balance $ 34 $ 31 $ 27
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 25 25 16
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (133) (36) (520)
Redeemable Noncontrolling Interest Ending Balance 28 34 31
Temporary Equity, Foreign Currency Translation Adjustments 0 1 (3)
Temporary Equity, Stock Issued During Period, Value, New Issues $ (31) $ (23) $ (9)