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Note 9. Equity and Noncontrolling Interests Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interest Beginning Balance $ 28 $ 34
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 7 5
Temporary Equity, Foreign Currency Translation Adjustments 1 (1)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 8 0
Temporary Equity, Stock Issued During Period, Value, New Issues 1 0
Redeemable Noncontrolling Interest Ending Balance $ 29 $ 38