Business Acquisitions - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Feb. 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Revenues		$ 1,641	$ 1,570	$ 4,811	$ 4,653
Goodwill		8,352		8,352		$ 7,845
Goodwill deductible for income tax purposes		64		64
Gracenote
Business Acquisition [Line Items]
Percentage ownership interest acquired	100.00%
Payments to acquire businesses	$ 585
Acquisition Date	Feb. 01, 2017
Revenues				148
Gross contractual receivable	$ 37
Acquired receivables, estimated uncollectible	1
Goodwill	314
Provisional allocation of purchase price to identified intangible assets	$ 341
Goodwill deductible for income tax purposes		$ 23		23
Acquisition related expenses				6
Other acquisitions
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired				$ 28	$ 263