Business Acquisitions - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Feb. 01, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Revenues		$ 1,526	$ 1,487
Goodwill		8,212		$ 7,845
Goodwill deductible for income tax purposes		71
Gracenote
Business Acquisition [Line Items]
Percentage ownership interest acquired	100.00%
Payments to acquire businesses	$ 582
Acquisition Date	Feb. 01, 2017
Revenues		34
Gross contractual receivable	$ 37
Acquired receivables, estimated uncollectible	1
Goodwill	311
Provisional allocation of purchase price to identified intangible assets	$ 341
Goodwill deductible for income tax purposes		24
Acquisition related expenses		4
Other acquisitions
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired		$ 8	$ 47