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Note 7. Leases Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense, Net $ 126 $ 120 $ 171
Capital Leases, Future Minimum Payments Due, Next Twelve Months 3    
Operating Leases, Future Minimum Payments Due, Next Twelve Months 114    
Capital Leases, Future Minimum Payments Due in Two Years 2    
Operating Leases, Future Minimum Payments, Due in Two Years 81    
Capital Leases, Future Minimum Payments Due in Three Years 0    
Operating Leases, Future Minimum Payments, Due in Three Years 62    
Capital Leases, Future Minimum Payments Due in Four Years 0    
Operating Leases, Future Minimum Payments, Due in Four Years 50    
Capital Leases, Future Minimum Payments Due in Five Years 0    
Operating Leases, Future Minimum Payments, Due in Five Years 36    
Capital Leases, Future Minimum Payments Due Thereafter 0    
Operating Leases, Future Minimum Payments, Due Thereafter 52    
Capital Leases, Future Minimum Payments Due 5    
Operating Leases, Future Minimum Payments Due 395    
Capital Leases, Future Minimum Payments, Interest Included in Payments 1    
Capital Lease Obligations $ 4 $ 2