Business Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Feb. 01, 2017	Dec. 31, 2016
Identifiable assets acquired and liabilities assumed:
Goodwill	$ 8,352		$ 7,845
Gracenote
Identifiable assets acquired and liabilities assumed:
Cash		$ 11
Other current assets		56
Property and equipment		12
Goodwill		314
Amortizable intangible assets		341
Other long-term assets		11
Deferred revenue		(22)
Other current liabilities		(21)
Deferred tax liabilities		(110)
Other long-term liabilities		(7)
Total		$ 585