Additional Financial Information - Components of Other Current Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Assets, Current [Abstract]
Assets held for sale	$ 334	$ 0
Other	419	515
Total Other current assets	$ 753	$ 515

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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