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Revenues - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Jul. 01, 2018	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		$ 2,524	$ 2,058
Revenue from performance obligation		80
Revenue from remaining performance obligation		300
2019 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from remaining performance obligation		$ 90
Expected period of performance obligation to be recognized		1 year
2020 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from remaining performance obligation		$ 110
Expected period of performance obligation to be recognized		1 year
2021 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from remaining performance obligation		$ 80
Expected period of performance obligation to be recognized		1 year
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings	$ 20
ASC 606 [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		$ (17)
Subscription Video Services [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		565	$ 145
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		28
Financial Services [Member] \| REA Group Inc [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Commission receivable	121
Commission payable	$ 94
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		$ 6