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Option Activity - Baidu, Inc. (Detail) - Parent Company - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share Option Roll Forward - Number of shares    
Outstanding, December 31, 2016 231,239  
Granted 151,990  
Exercised (57,072)  
Forfeited/Cancelled (10,760)  
Outstanding, December 31, 2017 315,397 231,239
Vested and expected to vest at December 31, 2017 266,234  
Exercisable at December 31, 2017 100,197  
Share Option Roll Forward - Weighted-Average Exercise Price    
Outstanding, December 31, 2016 $ 1,537.40  
Granted 1,860.29  
Exercised 1,177.53  
Forfeited/Cancelled 1,691.10  
Outstanding, December 31, 2017 1,752.90 $ 1,537.40
Vested and expected to vest at December 31, 2017 1,729.96  
Exercisable at December 31, 2017 $ 1,500.53  
Share Option Roll Forward - Weighted-Average Remaining Contractual Life (in years)    
Outstanding 7 years 9 months 29 days 7 years 2 months 30 days
Vested and expected to vest at December 31, 2017 7 years 8 months 2 days  
Exercisable at December 31, 2017 5 years 9 months 25 days  
Share Option Roll Forward - Aggregate Intrinsic Value (in thousands)    
Outstanding, December 31, 2016 $ 62  
Outstanding, December 31, 2017 186 $ 62
Vested and expected to vest at December 31, 2017 163  
Exercisable at December 31, 2017 $ 84