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Note 5. Goodwill and Other Intangible Assets Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Goodwill [Line Items]      
Goodwill $ 2,515 $ 2,179 $ 2,160
Goodwill, Acquired During Period 284 0  
Goodwill, Written off Related to Sale of Business Unit 0 0  
Goodwill, Foreign Currency Translation Gain (Loss) $ 52 $ 19