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Computation of Basic and Diluted Earnings Per Class A and Class B Ordinary Share (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares	Dec. 31, 2015 CNY (¥) ¥ / shares shares
Numerator
Allocation of net income attributable to Baidu, Inc.	$ 2,815	¥ 18,318	¥ 11,075	¥ 33,335
Class A Ordinary Shares
Numerator
Allocation of net income attributable to Baidu, Inc.	$ 2,226	¥ 14,488	¥ 8,710	¥ 26,183
Denominator
Denominator used for basic EPS	27,464,760	27,464,760	27,263,984	27,428,861
Earnings per share - basic | (per share)	$ 81.08	¥ 527.51	¥ 319.47	¥ 954.56
Numerator
Allocation of net income attributable to Baidu, Inc. for diluted computation	$ 2,230	¥ 14,513	¥ 8,716	¥ 26,206
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares	585	3,805	2,359	7,129
Numerator for diluted EPS calculation	$ 2,815	¥ 18,318	¥ 11,075	¥ 33,335
Denominator
Weighted average ordinary shares outstanding	27,464,760	27,464,760	27,263,984	27,428,861
Conversion of Class B to Class A ordinary shares	7,260,363	7,260,363	7,401,254	7,492,921
Share-based awards	227,268	227,268	91,848	112,688
Denominator used for diluted EPS	34,952,391	34,952,391	34,757,086	35,034,470
Earnings per share - diluted | (per share)	$ 80.55	¥ 524.08	¥ 318.62	¥ 951.49
Class B Ordinary Shares
Numerator
Allocation of net income attributable to Baidu, Inc.	$ 589	¥ 3,830	¥ 2,365	¥ 7,152
Denominator
Denominator used for basic EPS	7,260,363	7,260,363	7,401,254	7,492,921
Earnings per share - basic | (per share)	$ 81.08	¥ 527.51	¥ 319.47	¥ 954.56
Numerator
Allocation of net income attributable to Baidu, Inc. for diluted computation	$ 585	¥ 3,805	¥ 2,359	¥ 7,129
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares	0	0	0	0
Numerator for diluted EPS calculation	$ 585	¥ 3,805	¥ 2,359	¥ 7,129
Denominator
Weighted average ordinary shares outstanding	7,260,363	7,260,363	7,401,254	7,492,921
Conversion of Class B to Class A ordinary shares	0	0	0	0
Share-based awards	0	0	0	0
Denominator used for diluted EPS	7,260,363	7,260,363	7,401,254	7,492,921
Earnings per share - diluted | (per share)	$ 80.55	¥ 524.08	¥ 318.62	¥ 951.49
American Depositary Shares | Class A Ordinary Shares
Denominator
Denominator used for basic EPS	274,647,600	274,647,600	272,639,840	274,288,610
Earnings per share - basic | (per share)	$ 8.11	¥ 52.75	¥ 31.95	¥ 95.46
Denominator
Weighted average ordinary shares outstanding	274,647,600	274,647,600	272,639,840	274,288,610
Denominator used for diluted EPS	349,523,910	349,523,910	347,570,860	350,344,700
Earnings per share - diluted | (per share)	$ 8.06	¥ 52.41	¥ 31.86	¥ 95.15

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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