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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 1,517	$ 1,643
Advertising and promotional expenses	525	669	$ 663
Advertising
Significant Accounting Policies [Line Items]
Revenue reclassifications			$ 57
Wireless Group Plc
Significant Accounting Policies [Line Items]
Restricted cash	$ 0	0
Maximum
Significant Accounting Policies [Line Items]
Interest owned to exercise significant influence	50.00%
Property, plant and equipment, useful life	50 years
Unearned advances write-off period	24 months
Minimum
Significant Accounting Policies [Line Items]
Interest owned to exercise significant influence	20.00%
Property, plant and equipment, useful life	3 years
Unearned advances write-off period	12 months
Capitalized software \| Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	13 years
Capitalized software \| Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
REA Group
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 153	$ 97