Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Related Party Transactions [Abstract]
Net sales to related parties	$ 99	$ 92
Purchases from related parties	177	$ 173
Accounts receivable due from related parties	60		$ 73
Accounts payable due to related parties	$ 103		$ 137

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant