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Note 20. Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties $ 129 $ 172  
Revenue from Related Parties 409 438 $ 392
Related Party Transaction, Purchases from Related Party 511 443 393
Accounts Payable, Related Parties 104 96  
Related Party Transaction, Amounts of Transaction $ 87    
Corporate, Non-Segment [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party   294 361
Separation costs incurred by parent- benefited directly [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party   369  
Separation costs incurred by parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party   $ 458 $ 16