Revenues - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 02, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		$ 2,627,000,000	$ 2,180,000,000	$ 5,151,000,000	$ 4,238,000,000
Revenue from performance obligation		72,000,000		152,000,000
Revenue from remaining performance obligation		310,000,000		310,000,000
Impact on net income		119,000,000	(66,000,000)	247,000,000	21,000,000
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		(20,000,000)		(37,000,000)
Impact on net income		8,000,000		13,000,000
Subscription Video Services [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		562,000,000	$ 120,000,000	1,127,000,000	$ 265,000,000
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		(34,000,000)		(62,000,000)
Impact on net income		0		0
January 1, 2019 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from remaining performance obligation		$ 79,000,000		$ 79,000,000
Expected period of performance obligation to be recognized		6 months		6 months
July 1, 2020 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from remaining performance obligation		$ 119,000,000		$ 119,000,000
Expected period of performance obligation to be recognized		1 year		1 year
July 1, 2021 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from remaining performance obligation		$ 89,000,000		$ 89,000,000
Expected period of performance obligation to be recognized		1 year		1 year
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		$ 7,000,000		$ 13,000,000
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