Related Party Transactions (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended	6 Months Ended
May 31, 2018	Sep. 30, 2017	Sep. 30, 2017
Related Party Transactions [Abstract]
Corporate allocations from Parent for management and support functions	$ 24	$ 41	$ 84

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

No definition available.

Name:	us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration