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Restructuring and Related Reorganization Charges - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring and Related Activities [Abstract]      
Restructuring and related reorganization charges [1] $ 0 $ 17,000,000 $ 56,000,000
Restructuring reserve   $ 9,000,000  
[1] (1) Includes stock-based compensation as follows: Cost of revenue$11 $10 $11Selling and marketing44 40 47Technology and content61 55 63General and administrative87 44 108Restructuring and related reorganization charges— — 13