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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

X

- Definition

Amount for accounts payable to related parties.

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