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Note 9, Equity and Noncontrolling Interests Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Redeemable Noncontrolling Interest [Line Items]          
Redeemable Noncontrolling Interest Beginning Balance       $ 34  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax $ 131 $ (85)   (226) $ (52)
Payments of Ordinary Dividends, Noncontrolling Interest       47 34
Redeemable Noncontrolling Interest Ending Balance 22     22  
Redeemable Noncontrolling Interest [Member]          
Redeemable Noncontrolling Interest [Line Items]          
Redeemable Noncontrolling Interest Beginning Balance 46 42   34 31
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 6   $ 7 18 19
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 1   0 1 1
Payments of Ordinary Dividends, Noncontrolling Interest (31)   0 (31) (2)
Redeemable Noncontrolling Interest Ending Balance $ 22 $ 49 $ 42 $ 22 $ 49