Consideration and Preliminary Identification of Assets Acquired, Including Cash Acquired and Liabilities Assumed as well as Fair Value Of Noncontrolling Interests (Parenthetical) (Detail) - AOL Inc - USD ($) $ in Millions			9 Months Ended
	Jun. 23, 2015		Sep. 30, 2016
Business Acquisition [Line Items]
Cash payment to AOL's equity holders	$ 3,764		$ 179
Estimated liabilities to be paid	$ 377	[1]	$ 198

[1] During the nine months ended September 30, 2016, we made cash payments of $179 million in respect of acquisition-date estimated liabilities to be paid. As of September 30, 2016, the remaining balance of estimated liabilities to be paid was $198 million.