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Revenues - Additional Information (Detail) - USD ($)		3 Months Ended								12 Months Ended
Revenues - Additional Information (Detail) - USD ($)	Jul. 01, 2018	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue										$ 10,074,000,000	$ 9,024,000,000	$ 8,139,000,000
Revenue from performance obligation										316,000,000
Revenue from remaining performance obligation		$ 354,000,000								354,000,000
Impact on net income		$ (42,000,000)	$ 23,000,000	$ 119,000,000	$ 128,000,000	$ (355,000,000)	$ (1,110,000,000)	$ (66,000,000)	$ 87,000,000	228,000,000	(1,444,000,000)	(643,000,000)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings	$ 20,000,000
ASC 606 [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue										(72,000,000)
Impact on net income										16,000,000
Subscription Video Services [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue										2,202,000,000	$ 1,004,000,000	$ 494,000,000
Reclassification of Marketing and Sales Incentive Payments [Member] \| Subscription Video Services, Book Publishing and News and Information Services [Member] \| ASC 606 [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue										113,000,000
Impact on net income										0
Installation Operations [Member] \| Subscription Video Services [Member] \| ASC 606 [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue										$ 23,000,000
Financial Services [Member] \| REA Group Inc [Member] \| Accounting Standards Update 2014-09 [Member] \| Commission Receivable [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Commission receivable	121,000,000
Financial Services [Member] \| REA Group Inc [Member] \| Accounting Standards Update 2014-09 [Member] \| Commission Payable [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Commission payable	$ 94,000,000