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Note 12. Equity and Noncontrolling Interests (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Equity [Abstract]          
Non-cash Settlement With Parent     $ 1,500    
Common Stock, Dividends, Per Share, Cash Paid $ 0.275 $ 0.275      
Common Stock, Dividends, Per Share, Declared $ 0.275   $ 0.825 $ 0 $ 0
Stock Repurchased During Period, Shares     573,437    
Payments for Repurchase of Common Stock     $ 40 $ 0 $ 0