Baidu (BIDU) 20-F 27 Mar 15 2014 FY Annual report (foreign) Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 31, 2014
Document Information [Line Items]
Document Type	20-F
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	BIDU
Entity Registrant Name	Baidu, Inc.
Entity Central Index Key	1329099
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Class A Ordinary Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	27,613,315
Class B Ordinary Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	7,492,921

Consolidated_Balance_Sheets

Consolidated Balance Sheets	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares
				USD ($)	CNY	CNY	USD ($)	CNY	CNY
Current assets:
Cash and cash equivalents	$2,232,654	13,852,725	9,691,797
Restricted cash	66,565	413,010	259,533
Short-term investments	7,062,186	43,818,037	28,734,761
Accounts receivable, net of allowance of RMB43,814 and RMB93,877 (US$15,130) for 2013 and 2014, respectively	590,602	3,664,447	2,220,846
Deferred tax assets, net	110,394	684,952	286,844
Amounts due from related parties	8	50	104
Other current assets, net	549,177	3,407,427	1,835,265
Total current assets	10,611,586	65,840,648	43,029,150
Non-current assets:
Fixed assets, net	1,403,050	8,705,364	5,370,268
Intangible assets, net	576,082	3,574,359	3,630,315
Goodwill	2,807,416	17,418,895	16,864,350
Long-term investments, net	463,998	2,878,922	634,777
Deferred tax assets, net	41,764	259,127	97,940
Amounts due from related parties	0	0	370,916
Other non-current assets	158,622	984,193	988,072
Total non-current assets	5,450,932	33,820,860	27,956,638
Total assets	16,062,518	99,661,508	70,985,788
Current liabilities (including amounts of the consolidated VIEs without recourse to the primary beneficiaries of RMB4,031,176 and RMB9,813,366 (US$1,581,628) as of December 31, 2013 and 2014, respectively):
Short-term loans	14,989	93,000	0
Accounts payable and accrued liabilities	2,089,562	12,964,893	7,362,138
Customer advances and deposits	692,460	4,296,440	2,977,872
Deferred revenue	26,562	164,809	226,599
Deferred income	83,574	518,543	77,287
Long-term loans, current portion	349,322	2,167,405	343,625
Amounts due to related parties	1,351	8,385	398
Capital lease obligation	9,242	57,346	44,907
Total current liabilities	3,267,062	20,270,821	11,032,826
Non-current liabilities (including amounts of the consolidated VIEs without recourse to the primary beneficiaries of RMB975,793 and RMB781,835 (US$126,009) as of December 31, 2013 and 2014, respectively):
Deferred income	6,387	39,626	376,491
Long-term loans	299,778	1,860,000	2,112,359
Notes payable	3,488,867	21,647,023	15,116,990
Deferred tax liabilities	184,350	1,143,821	1,200,270
Amounts due to related parties	1	8	373,227
Capital lease obligation	8,071	50,079	40,999
Other non-current liabilities	23,296	144,542	67,376
Total non-current liabilities	4,010,750	24,885,099	19,287,712
Total	7,277,812	45,155,920	30,320,538
Commitments and contingencies
Redeemable noncontrolling interests	305,338	1,894,502	0
Equity
Ordinary shares, value				2	12	12	0	3	3
Additional paid-in capital	585,682	3,633,919	3,056,418
Retained earnings	7,681,361	47,659,772	34,525,386
Accumulated other comprehensive income	37,379	231,923	843,096
Total Baidu, Inc. shareholders' equity	8,304,424	51,525,629	38,424,915
Noncontrolling interests	174,944	1,085,457	2,240,335
Total equity	8,479,368	52,611,086	40,665,250
Total liabilities, redeemable noncontrolling interests and equity	$16,062,518	99,661,508	70,985,788

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Class A Ordinary Shares	Class A Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares
	USD ($)		USD ($)
Common stock, par value per share	$0.00		$0.00
Common stock, shares authorized	825,000,000	825,000,000	35,400,000	35,400,000
Common stock, shares issued	27,613,315	27,492,452	7,492,921	7,537,921
Common stock, shares outstanding	27,613,315	27,492,452	7,492,921	7,537,921

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY	Common Class A and Class B	Common Class A and Class B	Common Class A and Class B	Common Class A and Class B	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares
					USD ($)	CNY	CNY	CNY	American Depositary Shares	American Depositary Shares	American Depositary Shares	American Depositary Shares
									USD ($)	CNY	CNY	CNY
Revenues:
Online marketing services	$7,816,010	48,495,215	31,802,219	22,245,643
Others	89,789	557,103	141,705	60,383
Total revenues	7,905,799	49,052,318	31,943,924	22,306,026
Operating costs and expenses:
Cost of revenues	-3,043,781	-18,885,450	-11,471,839	-6,448,545
Selling, general and administrative	-1,673,298	-10,382,142	-5,173,533	-2,501,336
Research and development	-1,125,127	-6,980,962	-4,106,832	-2,304,825
Total operating costs and expenses	-5,842,206	-36,248,554	-20,752,204	-11,254,706
Operating profit	2,063,593	12,803,764	11,191,720	11,051,320
Other income:
Interest income	321,184	1,992,818	1,308,542	866,465
Interest expense	-101,307	-628,571	-447,084	-107,857
Foreign exchange (loss) income, net	12,214	75,780	-48,379	-4,533
Loss from equity method investments	-4,344	-26,952	-5,806	-294,229
Others, net	41,534	257,704	186,023	454,271
Total other income, net	269,281	1,670,779	993,296	914,117
Income before income taxes	2,332,874	14,474,543	12,185,016	11,965,437
Income taxes	-359,599	-2,231,172	-1,828,930	-1,574,159
Net income	1,973,275	12,243,371	10,356,086	10,391,278
Net loss attributable to noncontrolling interests	152,097	943,698	162,880	64,750
Net income attributable to Baidu, Inc.	2,125,372	13,187,069	10,518,966	10,456,028
Basic					$60.37	374.6	299.75	298.62	$6.04	37.46	29.98	29.86
Diluted					$60.14	373.15	299.32	298.29	$6.01	37.32	29.93	29.83
Weighted average number of Class A and Class B ordinary shares outstanding
Basic					35,062,466	35,062,466	34,986,228	34,939,838
Diluted					35,198,474	35,198,474	35,036,346	34,979,459
Other comprehensive income (loss):
Foreign currency translation adjustment	-71,835	-445,710	190,322	-6,100
Unrealized gains (losses) on available-for-sale investments, net of reclassification	-23,420	-145,310	668,372	11,391
Other comprehensive income (loss), net of tax	-95,255	-591,020	858,694	5,291
Comprehensive income	1,878,020	11,652,351	11,214,780	10,396,569
Comprehensive loss attributable to noncontrolling interests	148,848	923,545	225,560	65,584
Comprehensive income attributable to Baidu, Inc.	$2,026,868	12,575,896	11,440,340	10,462,153

Consolidated_Statements_Of_Com1

Consolidated Statements Of Comprehensive Income (Parenthetical) (Class A Ordinary Shares)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class A Ordinary Shares
Number of American depositary shares ("ADSs") representing one Class A ordinary share	10	10	10

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Cash flows from operating activities:
Net income	$1,973,275	12,243,371	10,356,086	10,391,278
Adjustments to reconcile net income to net cash generated from operating activities:
Depreciation of fixed assets and computer parts	358,429	2,223,907	1,702,140	1,281,336
Gain on disposal of fixed assets	-3,932	-24,395	-16,051	-2,783
Amortization of intangible assets and licensed copyrights	281,789	1,748,387	949,850	234,001
Deferred income tax, net	-111,764	-693,448	330,636	-59,030
Share-based compensation	155,166	962,740	514,727	212,309
(Reversal of) provision for doubtful accounts	12,486	77,472	39,137	-847
Investment income	-310,930	-1,929,192	-1,100,054	-745,526
Net gain from step-acquisition and settlement of pre-existing relationship	-12,125	-75,229	0	-486,339
Assets impairment	15,319	95,049	24,197	169,180
Loss from equity method investments	4,344	26,952	5,806	294,229
Gain on disposal of a subsidiary	0	0	0	-15,238
Other noncash (income) expense	5,228	32,435	19,186	-57,544
Changes in operating assets and liabilities, net of effects of acquisitions:
Restricted cash	-8,232	-51,077	-151,435	85,429
Accounts receivable	-235,645	-1,462,086	-773,787	-338,602
Other assets	-262,505	-1,628,737	-1,303,334	-10,664
Amounts due from related parties	59,790	370,970	-54	-794,508
Customer advances and deposits	211,747	1,313,806	866,620	489,769
Accounts payable and accrued liabilities	810,509	5,028,890	2,005,559	778,003
Deferred revenue	-9,959	-61,790	122,347	31,416
Deferred income	16,825	104,391	199,272	199,785
Amounts due to related parties	-58,866	-365,241	2,123	340,340
Net cash generated from operating activities	2,890,949	17,937,175	13,792,971	11,995,994
Cash flows from investing activities:
Acquisition of fixed assets	-777,997	-4,827,163	-2,756,629	-2,310,860
Acquisition of computer parts	-693	-4,302	-12,194	-28,901
Proceeds from disposal of fixed assets	3,291	20,422	18,476	6,785
Acquisition of businesses, net of cash acquired (Note 3)	-53,008	-328,891	-13,201,126	-820,526
Acquisition of intangible assets	-252,030	-1,563,746	-909,717	-190,303
Capitalization of software costs	0	0	-2,448	-36,315
Purchases of held-to-maturity investments	-8,921,893	-55,356,781	-30,441,279	-26,368,017
Sales and maturities of held-to-maturity investments	6,035,804	37,449,747	29,562,045	19,351,949
Purchases of available-for-sale investments	-12,576,721	-78,033,523	-53,921,661	-6,774,500
Sales and maturities of available-for-sale investments	13,204,921	81,931,252	48,947,811	3,477,463
Purchases of other long-term investments	-286,454	-1,777,331	-350,361	-58,666
Sales of long-term investments	3,604	22,362	0	0
Cash distribution of long-term investments	29	180	4,143	2,811
Net cash used in investing activities	-3,621,147	-22,467,774	-23,062,940	-13,749,080
Cash flows from financing activities:
Restricted cash	-16,504	-102,400	0	0
Proceeds from issuance of subsidiaries' shares	297,653	1,846,819	1,397,283	100,460
Payments to acquire subsidiaries' shares from noncontrolling interests	-100,403	-622,961	-259,879	-1,020
Proceeds from short-term loans	14,897	92,432	0	0
Repayment of short-term loans	0	0	-47,200	-124,602
Proceeds from long-term loans	291,339	1,807,646	2,144,450	355,499
Repayment of long-term loans	-56,033	-347,659	-2,144,450	-140,000
Payment of dividends by a subsidiary	-54,470	-337,964	0	0
Proceeds from issuance of notes payable	997,362	6,188,232	6,111,200	9,334,777
Payment of capital lease obligation	-11,736	-72,817	-36,629	-27,124
Payment of debt issuance costs	-5,192	-32,216	-39,400	-37,099
Proceeds from exercise of share options	31,081	192,848	156,307	56,974
Net cash generated from financing activities	1,387,994	8,611,960	7,281,682	9,517,865
Effect of exchange rate changes on cash and cash equivalents	12,824	79,567	-200,548	-11,629
Net increase (decrease) in cash and cash equivalents	670,620	4,160,928	-2,188,835	7,753,150
Cash and cash equivalents at beginning of the year	1,562,034	9,691,797	11,880,632	4,127,482
Cash and cash equivalents at end of the year	2,232,654	13,852,725	9,691,797	11,880,632
Supplemental disclosures:
Interests paid	95,535	592,759	302,055	38,027
Income taxes paid	450,962	2,798,040	1,656,513	1,641,853
Non-cash investing and financing activities:
Capital lease obligation	15,204	94,336	45,554	56,220
Acquisition of fixed assets included in accounts payable and accrued liabilities	182,424	1,131,870	787,154	332,473
Acquisition of other non-current assets included in accounts payable and accrued liabilities	6,356	39,437	40,303	39,165
Non-cash acquisitions of investments	12,125	75,229	0	705,281
Non-cash acquisitions of subsidiaries	$0	0	0	338,447

Consolidated_Statements_Of_Sha

Consolidated Statements Of Shareholders' Equity	Total	Total	Ordinary Shares	Ordinary Shares	Additional Paid-in Capital	Additional Paid-in Capital	Retained Earnings	Retained Earnings	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss	Noncontrolling interests	Noncontrolling interests
In Thousands, except Share data	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY
Balances at Dec. 31, 2011		15,389,535		15		1,771,770		13,604,334		-84,403		97,819
Balances (in shares) at Dec. 31, 2011				34,914,117
Net income		10,447,082						10,456,028				-8,946
Other comprehensive income (loss)		5,981								6,125		-144
Business combination		32,507										32,507
Change of a subsidiary's noncontrolling interests		-1,259										-1,259
Acquisition of subsidiaries' shares from noncontrolling shareholders		-1,021				-1,499						478
Disposal of a subsidiary		5,253										5,253
Accretion of redeemable noncontrolling interests		-22,143						-22,143
Exercise of share-based awards (in shares)				51,593
Exercise of share-based awards		54,171				54,171
Share-based compensation		197,265				196,360						905
Issuance of subsidiary shares		74,471				74,471
Balances at Dec. 31, 2012		26,181,842		15		2,095,273		24,038,219		-78,278		126,613
Balances (in shares) at Dec. 31, 2012				34,965,710
Net income		10,417,943						10,518,966				-101,023
Other comprehensive income (loss)		914,114								921,374		-7,260
Business combination		427,813										427,813
Acquisition of subsidiaries' shares from noncontrolling shareholders		-138,439				-138,439
Accretion of redeemable noncontrolling interests		-31,799						-31,799
Reclassification of redeemable noncontrolling interests		888,934										888,934
Exercise of share-based awards (in shares)				64,663
Exercise of share-based awards		166,253				165,403						850
Share-based compensation		505,653				485,185						20,468
Issuance of subsidiary shares		1,332,936				448,996						883,940
Balances at Dec. 31, 2013		40,665,250		15		3,056,418		34,525,386		843,096		2,240,335
Balances (in shares) at Dec. 31, 2013				35,030,373
Net income		12,243,371						13,187,069				-943,698
Other comprehensive income (loss)		-591,020								-611,173		20,153
Business combination		150,000										150,000
Acquisition of subsidiaries' shares from noncontrolling shareholders		-622,961				-406,285						-216,676
Dividends distribution by a subsidiary		-337,964										-337,964
Accretion of redeemable noncontrolling interests	-8,493	-52,683						-52,683
Exercise of share-based awards (in shares)			75,863	75,863
Exercise of share-based awards		192,848				184,815						8,033
Share-based compensation		959,245				798,971						160,274
Issuance of subsidiary shares		5,000										5,000
Balances at Dec. 31, 2014	$8,479,368	52,611,086	$2	15	$585,682	3,633,919	$7,681,361	47,659,772	$37,379	231,923	$174,944	1,085,457
Balances (in shares) at Dec. 31, 2014			35,106,236

Organization_Consolidation_and

Organization, Consolidation and Presentation of Financial Statements	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements	1.    ORGANIZATION, CONSOLIDATION AND PRESENTATION OF FINANCIAL STATEMENTS
	Baidu, Inc. (“Baidu” or the “Company”) was incorporated under the laws of the Cayman Islands on January 18, 2000.
	As of December 31, 2014, the Company has subsidiaries incorporated in countries and jurisdictions including the People’s Republic of China (“PRC”), Hong Kong, Japan, Cayman Islands and British Virgin Islands (“BVI”). As of December 31, 2014, the Company also effectively controls a number of variable interest entities (“VIE”) through the Primary Beneficiaries, as defined below. The VIEs include:
	•	Beijing Baidu Netcom Science Technology Co., Ltd. (“Baidu Netcom”), controlled through Baidu Online Network Technology (Beijing) Co., Ltd. (“Baidu Online”), one of the Company’s wholly-owned subsidiaries;
	•	Beijing Perusal Technology Co., Ltd. (“Beijing Perusal”), controlled through Baidu Online; and
	•	Beijing BaiduPay Science and Technology Co., Ltd. (“BaiduPay”), controlled through Baidu Online; and
	•	Other VIEs controlled through Primary Beneficiaries other than Baidu Online.
	The Company, its subsidiaries, VIEs and subsidiaries of the VIEs are hereinafter collectively referred to as the “Group”. The Group offers internet search solutions and online marketing solutions, operates an online payment platform which enables users to make payments online, develops and markets scalable web/mobile application software and provides related services, conducts online advertising business in connection with online video contents broadcasting, provides mobile application distribution services, offers online game services and provides group buying services. The Group’s principal geographic market is in the PRC. The Company does not conduct any substantive operations of its own, but conducts its primary business operations through its subsidiaries and VIEs in the PRC.
	PRC laws and regulations prohibit or restrict foreign ownership of internet content, advertising, and audio and video services. To comply with these foreign ownership restrictions, the Group operates its websites and primarily provides services subject to such restriction in the PRC through the VIEs, the PRC legal entities that were established or whose equity shares were held by the individuals authorized by the Group. The paid-in capital of the VIEs was mainly funded by the Group through loans extended to the authorized individuals who were the shareholders of the VIEs. The Group has entered into proxy agreements or power of attorney and exclusive equity purchase option agreement with the VIEs and nominee shareholders of the VIEs through the Group’s subsidiaries (“Primary Beneficiaries”), which give the Primary Beneficiaries the power to direct the activities that most significantly affect the economic performance of the VIEs and to acquire the equity interests in the VIEs when permitted by the PRC laws, respectively. Certain exclusive agreements have been entered into with the VIEs through the Primary Beneficiaries or their wholly-owned subsidiaries in the PRC, which obligate the Primary Beneficiaries to absorb a majority of the risk of loss from the VIEs’ activities and entitle the Primary Beneficiaries to receive a majority of their residual returns. In addition, the Group has entered into certain agreements with the shareholders of the VIEs through the Primary Beneficiaries or their wholly-owned subsidiaries in the PRC, including loan agreements for the paid-in capital of the VIEs and share pledge agreements for the equity interests in the VIEs held by the shareholders of the VIEs.
	Despite the lack of technical majority ownership, there exists a parent-subsidiary relationship between the Primary Beneficiaries and the VIEs through the aforementioned agreements with the shareholders of the VIEs. The shareholders of the VIEs effectively assigned all of their voting rights underlying their equity interest in the VIEs to the Primary Beneficiaries. In addition, through the other exclusive agreements, which consist of operating agreements, technology consulting and services agreements and license agreements, the Primary Beneficiaries, by themselves or their wholly-owned subsidiaries in the PRC, demonstrate their ability and intention to continue to exercise the ability to absorb substantially all of the profits and all of the expected losses of the VIEs. The VIEs are subject to operating risks, which determine the variability of the Company’s interest in those entities. Based on these contractual arrangements, the Company consolidates the VIEs as required by SEC Regulation S-X Rule 3A-02 and Accounting Standards Codification (“ASC”) topic 810 (“ASC 810”), Consolidation, because the Company holds all the variable interests of the VIEs through the Primary Beneficiaries.
	The principal terms of the agreements entered into amongst the VIEs, their respective shareholders and the Primary Beneficiaries are further described below.
	Loan Agreements
	Pursuant to loan agreements amongst the shareholders of Baidu Netcom and Baidu Online, Baidu Online provided interest-free loans with an aggregate amount of RMB100.0 million to the shareholders of Baidu Netcom solely for the latter to fund the capitalization of Baidu Netcom. The loans can be repaid only with the proceeds from sale of the shareholders’ equity interest in Baidu Netcom to Baidu Online or its designated person. The terms of the loan agreements will expire on February 9, 2016 at the earliest and can be extended with the written consent of both parties before its expiration.
	Each of the loan agreements amongst Baidu Online and the respective shareholders of Beijing Perusal and BaiduPay contains the same terms as those described above, except that the amount of the loans extended to the respective shareholders is RMB20.0 million and RMB31.5 million, respectively. The term of the loan agreements will expire on July 31, 2024 and September 15, 2024, respectively, and can be extended with the written consent of both parties before its expiration.
	Exclusive Equity Purchase and Transfer Option Agreement
	Pursuant to the exclusive equity purchase and transfer option agreement amongst the shareholders of Baidu Netcom, Baidu Netcom and Baidu Online, the shareholders of Baidu Netcom irrevocably granted Baidu Online or its designated person(s) an exclusive option to purchase, to the extent permitted under PRC law, all or part of the equity interests in Baidu Netcom for the cost of the initial contributions to the registered capital or the minimum amount of consideration permitted by applicable PRC law. The shareholders should remit to Baidu Online any amount that is paid by Baidu Online or its designated person(s) in connection with the purchased equity interest. Baidu Online or its designated person(s) have sole discretion to decide when to exercise the option, whether in part or in full. Any and all dividends and other capital distributions from Baidu Netcom to its shareholders should be paid to Baidu Online in full amount. Baidu Online would provide unlimited financial support to Baidu Netcom if, in the normal operation of business, Baidu Netcom would become in need of any form of reasonable financial support. If Baidu Netcom were to incur any loss and as a result cannot repay any loans from Baidu Online, Baidu Online should unconditionally forgive any such loans to Baidu Netcom given that Baidu Netcom provides sufficient proof for its loss and incapacity to repay. The agreement will terminate when the shareholders of Baidu Netcom have transferred all their equity interests in Baidu Netcom to Baidu Online or its designated person(s) or upon expiration of the term of business of Baidu Online or Baidu Netcom.
	Each of the exclusive equity purchase and transfer option agreements amongst Baidu Online and Beijing Perusal, BaiduPay and their respective shareholders contains the same terms as those described above. Each of the agreements will terminate upon the shareholders of Beijing Perusal or BaiduPay have transferred all their equity interests in Beijing Perusal or BaiduPay, as the case may be, to Baidu Online or its designated person(s) or upon expiration of the term of business of Baidu Online, Beijing Perusal or BaiduPay.
	Proxy Agreement/Power of Attorney
	Pursuant to the proxy agreement between Baidu Online and the shareholders of Baidu Netcom, the shareholders of Baidu Netcom agreed to entrust all the rights to exercise their voting power to the person(s) designated by Baidu Online. The shareholders of Baidu Netcom have each executed an irrevocable power of attorney to appoint the person(s) designated by Baidu Online as their attorney-in-fact to vote on their behalf on all matters requiring shareholder approval. The proxy agreement would be in effect for an unlimited term unless terminated in writing by Baidu Online earlier. The power of attorney would be in effect for as long as the shareholders of Baidu Netcom hold any equity interests in Baidu Netcom.
	Each of the proxy agreements amongst Baidu Online and the shareholders of Beijing Perusal and BaiduPay contains the same terms as those described above. Each of the proxy agreements will be in effect for an unlimited term unless terminated in writing by Baidu Online. Each of the powers of attorney will be in effect for as long as the shareholder of Beijing Perusal or BaiduPay holds any equity interests in Beijing Perusal or BaiduPay, as the case may be.
	Operating Agreement
	Pursuant to the operating agreement amongst Baidu Online, Baidu Netcom and the shareholders of Baidu Netcom, Baidu Online provides guidance and instructions on Baidu Netcom’s daily operations and financial affairs. Baidu Online has the power to appoint senior executives of Baidu Netcom. The shareholders of Baidu Netcom must appoint the candidates recommended by Baidu Online as their representatives on Baidu Netcom’s board of directors. In addition, Baidu Online agrees to guarantee Baidu Netcom’s performance under any agreements or arrangements relating to Baidu Netcom’s business arrangements with any third party. In return, Baidu Netcom agrees that without the prior consent of Baidu Online, Baidu Netcom will not engage in any transactions that could materially affect the assets, liabilities, rights or operations of Baidu Netcom, including, without limitation, incurrence or assumption of any indebtedness, sale or purchase of any assets or rights, incurrence of any encumbrance on any of its assets or intellectual property rights in favor of a third party or transfer of any agreements relating to its business operation to any third party. The agreement will be in effect for an unlimited term, until the term of business of Baidu Online or Baidu Netcom expires and extension is denied by the relevant approval authorities.
	Each of the operating agreements amongst Baidu Online and Beijing Perusal, BaiduPay and their respective shareholders contains the same terms as those described above. Each of the agreements will be in effect for an unlimited term, until the term of business of Baidu Online, Beijing Perusal or BaiduPay expires and extension is denied by the relevant approval authorities.
	Exclusive Technology Consulting and Services Agreement
	Pursuant to the exclusive technology consulting and services agreement between Baidu Online and Baidu Netcom, Baidu Online has the exclusive right to provide to Baidu Netcom technology consulting and services related to, among other things, the maintenance of servers, software development, design of advertisements, and e-commerce technical services. Baidu Online owns the intellectual property rights resulting from the performance of this agreement. Baidu Netcom pays a monthly service fee to Baidu Online based upon a pre-agreed formula as defined in the agreement. Baidu Online has the right to adjust the service fees at its sole discretion without the consent of Baidu Netcom. The agreement will be in effect for an unlimited term, until the term of business of one party expires and extension is denied by the relevant approval authorities.
	Each of the exclusive technology consulting and services agreements between Baidu Online and Beijing Perusal and between Baidu Online and BaiduPay contains the same terms as those described above, except for the formula calculating the service fees. Baidu Netcom and Beijing Perusal should pay Baidu Online a monthly service fee equal to the product of the standard monthly fee for page view per thousand times multiplied by the actual times of page view for the month divided by 1,000; and the agreement between Baidu Online and BaiduPay does not provide a formula to calculate the quarterly fee, as BaiduPay has yet to achieve profitability. Each of the agreements will be in effect for an unlimited term, until the term of business of one party expires and extension is denied by the relevant approval authorities.
	License Agreements
	Baidu Online and Baidu Netcom entered into a software license agreement, a trademark license agreement, a domain name license agreement and a web layout copyright license agreement (collectively, the “License Agreements”). Pursuant to the License Agreements between Baidu Online and Baidu Netcom, Baidu Online has granted to Baidu Netcom the right to use (including but not limited to) a software license, a web layout copyright license, a trademark license and a domain name. Baidu Netcom may only use the licenses in its own business operations. Baidu Online has the right to adjust the service fees at its sole discretion. The software license agreement and web layout copyright license agreement were renewed since their original expiration and would be in effect for an unlimited term, until the term of business of one party expires and extension is denied by the relevant approval authorities. The domain name license agreement was terminated in 2012 as Baidu Online transferred the relevant domain names to Baidu Netcom. The trademark license agreement was terminated in February 2013 after Baidu Online transferred its trademarks (including pending trademark applications) to Baidu Netcom.
	Baidu Online entered into a trademark license agreement, a domain name license agreement and a web layout copyright license agreement with both Beijing Perusal and BaiduPay. Each of the license agreements between Baidu Online and Beijing Perusal and between Baidu Online and BaiduPay contains the same terms as those described above. Each of the web layout copyright license agreements was renewed since original expiration and would be in effect for an unlimited term, until the term of business of one party expires and extension is denied by the relevant approval authorities. Each of the domain name license agreement was terminated in 2012 as Baidu Online transferred the relevant domain names to Beijing Perusal and BaiduPay. Each of the trademark license agreement was terminated in February 2013 after Baidu Online transferred its trademarks (including pending trademark applications) to Beijing Perusal and BaiduPay.
	Equity Pledge Agreement
	Pursuant to the equity pledge agreement between Baidu Online and the shareholders of Baidu Netcom, the shareholders of Baidu Netcom pledged all of their equity interests in Baidu Netcom to Baidu Online to guarantee their obligations under the loan agreement and Baidu Netcom’s performance of its obligations under the exclusive technology consulting and services agreement. If Baidu Netcom or its shareholders breach their respective contractual obligations, Baidu Online, as the pledgee, will be entitled to certain rights, including the right to sell the pledged equity interests. The shareholders of Baidu Netcom agreed not to dispose of the pledged equity interests or take any actions that would prejudice Baidu Online’s interest. The equity pledge agreement will expire two years after expiration of the term or the fulfillment by Baidu Netcom and its shareholders of their respective obligations under the exclusive technology consulting and services agreement and the loan agreement.
	Each of the equity pledge agreements amongst Baidu Online and the respective shareholders of Beijing Perusal and BaiduPay contains the same terms, including term period, as those described above.
	Each equity pledge is perfected by registration with relevant local administration for industry and commerce which is required for a property right under the PRC Property Rights Law.
	Through the design of the aforementioned agreements, the shareholders of the VIEs effectively assigned their full voting rights to Baidu Online, which gives Baidu Online the power to direct the activities that most significantly impact the VIEs’ economic performance. Baidu Online obtains the ability to approve decisions made by the VIEs and the ability to acquire the equity interests in the VIEs when permitted by PRC law. Baidu Online is obligated to absorb a majority of the expected losses from the VIEs’ activities through providing unlimited financial support to the VIEs and is entitled to receive a majority of residual returns from the VIEs through the exclusive technology consulting and service fees. As a result of these contractual agreements, Baidu Online is determined to be the primary beneficiary of the VIEs. Despite the lack of technical majority ownership, there exists a parent-subsidiary relationship between the Company and the VIEs through these contractual agreements, and the Company consolidates the VIEs through Baidu Online.
	There are similar agreements entered into by Primary Beneficiaries besides Baidu Online with their VIEs and the respective shareholders, which resulted in a parent-subsidiary relationship between the Company and these VIEs.
	In the opinion of the Company’s legal counsel, (i) the ownership structure of the Company and its VIEs is in compliance with existing PRC laws and regulations; (ii) the contractual arrangements with the VIEs and their shareholders are valid, binding and enforceable, and will not result in any violation of PRC laws or regulations currently in effect; and (iii) the Group’s business operations are in compliance with existing PRC laws and regulations in all material respects.
	However, uncertainties in the PRC legal system could cause the Company’s current ownership structure to be found in violation of any existing and/or future PRC laws or regulations and could limit the Company’s ability, through the Primary Beneficiaries, to enforce its rights under these contractual arrangements. Furthermore, shareholders of the VIEs may have interests that are different with those of the Company, which could potentially increase the risk that they would seek to act in contrary to the terms of the aforementioned agreements.
	In addition, if the current structure or any of the contractual arrangements were found to be in violation of any existing or future PRC law, the Company may be subject to penalties, which may include but not be limited to, the cancellation or revocation of the Company’s business and operating licenses, being required to restructure the Company’s operations or discontinue the Company’s operating activities. The imposition of any of these or other penalties may result in a material and adverse effect on the Company’s ability to conduct its operations. In such case, the Company may not be able to operate or control the VIEs, which may result in deconsolidation of the VIEs.
	The following tables set forth the assets, liabilities and results of operations of the VIEs and their subsidiaries included in the Company’s consolidated balance sheets and statements of comprehensive income:
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Assets
	Current
	Cash and cash equivalents		1,510,320			2,250,298			362,682
	Accounts receivable, net		1,373,443			2,744,793			442,380
	Others		1,607,462			3,665,314			590,741
			4,491,225			8,660,405			1,395,803
	Non-current
	Fixed assets, net		1,350,852			1,796,162			289,489
	Others		1,301,383			2,157,922			347,794
			2,652,235			3,954,084			637,283
	Total		7,143,460			12,614,489			2,033,086
	Third-party liabilities
	Current
	Accounts payable and accrued liabilities		2,944,821			6,073,083			978,803
	Customer advances and deposits		801,626			802,362			129,317
	Others		284,729			2,937,921			473,508
			4,031,176			9,813,366			1,581,628
	Non-current		975,793			781,835			126,009
	Total		5,006,969			10,595,201			1,707,637
	Inter-company liabilities
	Inter-company payable to subsidiaries for technology consulting and service fees		1,578,759			1,479,423			238,440
Others		510,821			889,530			143,366
Total		2,089,580			2,368,953			381,806
	For the years ended December 31,
	2012			2013			2014			2014
	RMB			RMB			RMB			US$
	(In thousands)
Total revenues		6,429,099			9,040,058			13,166,712			2,122,089
Net income (loss)		143,626			(248,664	)		(352,125	)		(56,752	)
Net cash provided by operating activities		1,399,892			1,354,802			1,392,039			224,356
Net cash used in investing activities		(1,033,164	)		(1,303,612	)		(2,430,505	)		(391,726	)
Net cash (used in) provided by financing activities		(88,971	)		595,132			1,778,444			286,633
As of December 31, 2014, there was no pledge or collateralization of the VIEs’ assets. The amount of the net liabilities of the VIEs was RMB349.67 million (US$56.36 million) as of December 31, 2014. The creditors of the VIEs’ third-party liabilities did not have recourse to the general credit of the Primary Beneficiaries in normal course of business. The Company did not provide or intend to provide financial or other supports not previously contractually required to the VIEs during the years presented.
Basis of Presentation
The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”).
Principles of Consolidation
The consolidated financial statements include the financial statements of the Company, its subsidiaries, VIEs and subsidiaries of the VIEs. All inter-company transactions and balances between the Company, its subsidiaries, VIEs and subsidiaries of the VIEs are eliminated upon consolidation. The Company has included the results of operations of acquired businesses from the respective dates of acquisition.
Use of Estimates
The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Management evaluates estimates, including those related to the accounts receivable allowances, fair values of options to purchase the Company’s or its subsidiaries’ ordinary shares, fair values of certain debt and equity investments, amortization of certain licensed copyright, impairment of long-lived assets, long-term investments and goodwill, the purchase price allocation and fair value of noncontrolling interests with respect to business combinations, and deferred tax valuation allowance, among others. Management bases the estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from these estimates.
Comparative Information
Certain items in the consolidated financial statements have been reclassified to conform to the current year’s presentation to facilitate comparison.
Currency Translation for Financial Statements Presentation
Translations of amounts from RMB into US$ for the convenience of the reader have been calculated at the exchange rate of RMB6.2046 per US$1.00 on December 31, 2014, the last business day in fiscal year 2014, as published on the website of the United States Federal Reserve Board. No representation is made that the RMB amounts could have been, or could be, converted into U.S. dollars at such rate.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Foreign Currency
	The Company’s functional currency is the US$. The Company’s subsidiaries, VIEs and subsidiaries of the VIEs determine their functional currencies based on the criteria of ASC topic 830 (“ASC 830”), Foreign Currency Matters. The Company uses the RMB as its reporting currency. The Company uses the average exchange rate for the year and the exchange rate at the balance sheet date to translate its operating results and financial position, respectively. Any translation gains (losses) are recorded in other comprehensive income (loss). Transactions denominated in foreign currencies are translated into the functional currency at the exchange rates prevailing on the transaction dates. Assets and liabilities denominated in foreign currencies are translated into the functional currency at the exchange rates prevailing at the balance sheet date. Exchange gains and losses are included in earnings as a component of other income.
	Segment Reporting
	In accordance with ASC topic 280 (“ASC 280”), Segment Reporting, the Company’s chief operating decision makers rely upon consolidated results of operations when making decisions about allocating resources and assessing performance of the Company; hence, the Company has only one single operating segment. The Company does not distinguish between markets or segments for the purpose of internal reporting.
	Business Combinations
	The Company accounts for its business combinations using the purchase method of accounting in accordance with ASC topic 805 (“ASC 805”), Business Combinations. The purchase method of accounting requires that the consideration transferred to be allocated to the assets, including separately identifiable assets and liabilities the Company acquired, based on their estimated fair values. The consideration transferred in an acquisition is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued as well as the contingent considerations and all contractual contingencies as of the acquisition date. The costs directly attributable to the acquisition are expensed as incurred. Identifiable assets, liabilities and contingent liabilities acquired or assumed are measured separately at their fair value as of the acquisition date, irrespective of the extent of any noncontrolling interests. The excess of (i) the total of cost of acquisition, fair value of the noncontrolling interests and acquisition date fair value of any previously held equity interest in the acquiree over (ii) the fair value of the identifiable net assets of the acquiree, is recorded as goodwill. If the cost of acquisition is less than the fair value of the net assets of the subsidiary acquired, the difference is recognized directly in earnings.
	In a business combination achieved in stages, the Company remeasures its previously held equity interest in the acquiree immediately before obtaining control at its acquisition-date fair value and the re-measurement gain or loss, if any, is recognized in earnings.
	The determination and allocation of fair values to the identifiable assets acquired, liabilities assumed and noncontrolling interests is based on various assumptions and valuation methodologies requiring considerable judgment from management. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. The Company determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets, forecasted life cycle and forecasted cash flows over that period.
	Cash and Cash Equivalents
	Cash and cash equivalents
	Cash and cash equivalents are stated at cost, which approximates fair value, and primarily consist of cash and investments in interest bearing demand deposit accounts, time deposits, highly liquid investments and money market funds. All time deposits, money market funds and other highly liquid investments with original maturities of three months or less from the date of purchase are classified as cash equivalents.
	Restricted cash
	Restricted cash mainly consists of the cash reserved in escrow accounts for the remaining payments in relation to compensation for postcombination services, cash collateral for repayment of short-term loans (Note 10), as well as the cash balances deposited by users or customers of the Group that were held for designated purposes.
	The cash balances deposited by users or customers of the Group for certain businesses are considered restricted because they cannot be used for the operations of the Group or any other purposes not designated by the users or customers. The deposited balance is included in the Group’s bank accounts until being used for the designated purposes or withdrawn by the users or customers.
	Accounts Receivable
	Accounts receivable are recognized and carried at original invoiced amount less an allowance for any potential uncollectible amounts. An estimate for doubtful debts is made when collection of the full amount is no longer probable. Bad debts are written off as incurred. The Company generally does not require collateral from its customers.
	The Company maintains allowances for doubtful accounts for estimated losses resulting from the failure of customers to make payments on time. The Company reviews the accounts receivable on a periodic basis and makes general and specific allowances when there is doubt as to the collectability of individual balances. In evaluating the collectability of individual receivable balances, the Company considers many factors, including the age of the balance, the customer’s payment history, its current credit-worthiness and current economic trends.
	Receivables from Online Payment Agencies
	Receivables from online payment agencies are cash due from the third-party online payment service providers for clearing transactions. The cash was paid or deposited by customers or users through these online payment agencies for services provided by the Company. The Company carefully considers and monitors the credit worthiness of the third-party payment service providers used. An allowance for doubtful accounts is recorded in the period in which a loss is determined to be probable. Receivable balances are written off after all collection efforts have been exhausted. As of December 31, 2013 and 2014, no allowance for doubtful accounts was provided for the receivables from online payment agencies.
	Investments
	Short-term investments
	All highly liquid investments with original maturities of greater than three months, but less than 12 months, are classified as short-term investments. Investments that are expected to be realized in cash during the next 12 months are also included in short-term investments. The Company accounts for short-term investments in accordance with ASC topic 320 (“ASC 320”), Investments – Debt and Equity Securities. The Company classifies the short-term investments in debt and equity securities as “held-to-maturity”, “trading” or “available-for-sale”, whose classification determines the respective accounting methods stipulated by ASC 320. Dividend and interest income, including amortization of the premium and discount arising at acquisition, for all categories of investments in securities are included in earnings. Any realized gains or losses on the sale of the short-term investments are determined on a specific identification method, and such gains and losses are reflected in earnings during the period in which gains or losses are realized.
	The securities that the Company has positive intent and ability to hold to maturity are classified as held-to-maturity securities and stated at amortized cost. For individual securities classified as held-to-maturity securities, the Company evaluates whether a decline in fair value below the amortized cost basis is other-than-temporary in accordance with the Company’s policy and ASC 320. When the Company intends to sell an impaired debt security or it is more-likely-than-not that it will be required to sell prior to recovery of its amortized cost basis, an other-than-temporary impairment is deemed to have occurred. In these instances, the other-than-temporary impairment loss is recognized in earnings equal to the entire excess of the debt security’s amortized cost basis over its fair value at the balance sheet date of the reporting period for which the assessment is made. When the Company does not intend to sell an impaired debt security and it is more-likely-than-not that it will not be required to sell prior to recovery of its amortized cost basis, the Company must determine whether or not it will recover its amortized cost basis. If the Company concludes that it will not, an other-than-temporary impairment exists and that portion of the credit loss is recognized in earnings, while the portion of loss related to all other factors is recognized in other comprehensive income.
	The securities that are bought and held principally for the purpose of selling them in the near term are classified as trading securities. Unrealized holding gains and losses for trading securities are included in earnings.
	Investments not classified as trading or as held-to-maturity are classified as available-for-sale securities. Available-for-sale investment is reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive income (loss). Realized gains or losses are included in earnings during the period in which the gain or loss is realized. An impairment loss on the available-for-sale securities would be recognized in the consolidated statements of comprehensive income when the decline in value is determined to be other-than-temporary.
	Long-term investments
	The Company’s long-term investments consist of cost method investments, equity method investments, held-to-maturity investments with original and remaining maturities of greater than 12 months, and available-for-sale investments.
	In accordance with ASC subtopic 325-20 (“ASC 325-20”), Investments-Other: Cost Method Investments, for investments in an investee over which the Company does not have significant influence and which do not have readily determinable fair value, the Company carries the investment at cost and only adjusts for other-than-temporary declines in fair value and distributions of earnings that exceed the Company’s share of earnings since its investment. Management regularly evaluates the impairment of the cost method investments based on performance and financial position of the investee as well as other evidence of market value. Such evaluation includes, but is not limited to, reviewing the investee’s cash position, recent financing, projected and historical financial performance, cash flow forecasts and financing needs. An impairment loss is recognized in earnings equal to the excess of the investment’s cost over its fair value at the balance sheet date of the reporting period for which the assessment is made. The fair value would then become the new cost basis of investment.
	Investments in entities in which the Company can exercise significant influence but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC topic 323 (“ASC 323”), Investments-Equity Method and Joint Ventures. Under the equity method, the Company initially records its investment at cost and the difference between the cost of the equity investee and the fair value of the underlying equity in the net assets of the equity investee is recognized as equity method goodwill, which is included in the equity method investment on the consolidated balance sheets. The Company subsequently adjusts the carrying amount of the investment to recognize the Company’s proportionate share of each equity investee’s net income or loss into earnings after the date of investment. The Company will discontinue applying the equity method if an investment (and additional financial supports to the investee, if any) has been reduced to zero. Under the conditions that the Company is not required to advance additional funds to an investee and the equity-method investment in ordinary shares is reduced to zero, if further investments are made that have a higher liquidation preference than ordinary shares, the Company would recognize the loss based on its percentage of the investment with the same liquidation preference, and the loss would be applied to those investments of a lower liquidation preference first before being further applied to the investments of a higher liquidation preference. The Company evaluates the equity method investments for impairment under ASC 323. An impairment loss on the equity method investments is recognized in earnings when the decline in value is determined to be other-than-temporary.
	Long-term held-to-maturity investments and available-for-sale investments are measured in the same manner as short-term held-to-maturity investments.
	Fair Value Measurements of Financial Instruments
	Financial instruments are in the form of cash and cash equivalents, restricted cash, short-term investments, accounts receivable, amounts due from and due to related parties, other receivables, long-term investments, accounts payable and accrued liabilities, customer advances and deposits, derivative instruments, capital lease obligation, notes payable and long-term loans. The carrying amounts of these financial instruments, except for long-term cost method investments, long-term equity method investments, long-term available-for-sale investments, long-term held-to-maturity investments, derivative instruments, notes payable and long-term loans, approximate their fair values because of their generally short maturities. Available-for-sale investments and derivative instruments were adjusted to fair value at each reporting date. The carrying amounts of long-term held-to-maturity investments and long-term loans approximate their fair values due to the fact that the related interest rates approximate the rates currently offered by financial institutions for similar debt instruments of comparable maturities. Based on the quoted market price as of December 31, 2014, the fair value of the notes payable was RMB21.81 billion (US$3.52 billion) (Note 21).
	Research, Development and Computer Software
	Capitalization of software developed for internal use
	The Company has capitalized certain internal use software development costs in accordance with ASC subtopic 350-40 (“ASC 350-40”), Intangibles-Goodwill and Other: Internal-Use Software, amounting to RMB38.13 million, RMB2.68 million and nil for the years ended December 31, 2012, 2013 and 2014, respectively. The Company capitalizes certain costs relating to software acquired, developed, or modified solely to meet the Company’s internal requirements and for which there are no substantive plans to market the software. These costs mainly include payroll and payroll-related costs for employees who are directly associated with and who devote time to the internal-use software projects during the application development stage. Capitalized internal-use software costs are included in “intangible assets, net”. The amortization expense for capitalized software costs amounted to RMB19.72 million, RMB31.65 million and RMB28.24 million (US$4.55 million) for the years ended December 31, 2012, 2013 and 2014, respectively. The unamortized amount of capitalized internal use software development costs was RMB41.48 million and RMB13.24 million (US$2.13 million) as of December 31, 2013 and 2014, respectively.
	Research and development expenses
	Research and development expenses consist primarily of personnel-related costs. The Company has expensed substantially all development costs incurred in the research and development of new products and new functionality added to the existing products except for certain internal use software development costs.
	Fixed Assets
	Fixed assets are stated at cost less accumulated depreciation. Depreciation is recorded on a straight-line basis over the shorter of the estimated useful lives of the assets or the term of the related lease, as follows:
	Office building	– 45 years
	Office building related facility, machinery and equipment	– 15 years
	Computer equipment	– 3 or 5 years
	Office equipment	– 3 or 5 years
	Vehicles	– 5 years
	Leasehold improvements	– over the shorter of lease terms or estimated useful lives of the assets
	Fixed assets have no estimated residual value except for the office building and its related facility, machinery and equipment, which have an estimated residual value of 4% of the cost.
	Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterments that extend the useful life of fixed assets are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in earnings.
	All direct and indirect costs that are related to the construction of fixed assets and incurred before the assets are ready for their intended use are capitalized as construction in progress. Construction in progress is transferred to specific fixed assets items and depreciation of these assets commences when they are ready for their intended use.
	Interest costs are capitalized if they are incurred during the acquisition, construction or production of a qualifying asset and such costs could have been avoided if expenditures for the assets have not been made. Capitalization of interest costs commences when the activities to prepare the asset are in progress and expenditures and borrowing costs are being incurred. Interest costs are capitalized until the assets are ready for their intended use. Interest costs capitalized for the years ended December 31, 2012, 2013 and 2014 were insignificant.
	Licensed copyrights of video content
	The current and non-current portions of licensed copyrights of video content are recorded in “Other current assets, net” or “Intangible assets, net”, respectively, at the lower of amortized cost or net realizable value. In accordance with ASC topic 920 (“ASC 920”), Entertainment-Broadcasters, costs incurred in purchased copyrights of video content are capitalized and amortized over the shorter of the license period or projected useful life of the video content. Any licensed copyrights that do not meet the criteria to be recorded are included in the commitments disclosure. The Company amortizes the licensed copyrights in “Cost of revenues” on an accelerated or on a straight line basis, as appropriate. If expectations of the usefulness of a video content are revised downward, the unamortized cost is written down to the estimated net realizable value. A write-down from unamortized cost to a lower estimated net realizable value establishes a new cost basis.
	Goodwill and Intangible Assets
	Goodwill
	The Company assesses goodwill for impairment in accordance with ASC subtopic 350-20 (“ASC 350-20”), Intangibles – Goodwill and Other: Goodwill, which requires that goodwill to be tested for impairment at the reporting unit level at least annually and more frequently upon the occurrence of certain events, as defined by ASC 350-20.
	Subsequent to the acquisitions in 2011 and thereafter, there were segment managers who regularly review operating results of certain acquired entities and the rest of the Group, which constitute three separate reporting units as of December 31, 2013 and 2014.
	The Company has the option to first assess qualitative factors to determine whether it is necessary to perform the two-step test in accordance with Accounting Standards Update (“ASU”) No. 2011-08 (“ASU 2011-08”), Testing Goodwill for Impairment. If the Company believes, as a result of the qualitative assessment, that it is more-likely-than-not that the fair value of the reporting unit is less than its carrying amount, the two-step quantitative impairment test described above is required. Otherwise, no further testing is required. In the qualitative assessment, the Company considers primary factors such as industry and market considerations, overall financial performance of the reporting unit, and other specific information related to the operations. In performing the two-step quantitative impairment test, the first step compares the carrying amount of the reporting unit to the fair value of the reporting unit based on either quoted market prices of the ordinary shares or estimated fair value using a combination of the income approach and the market approach. If the fair value of the reporting unit exceeds the carrying value of the reporting unit, goodwill is not impaired and the Company is not required to perform further testing. If the carrying value of the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. The fair value of the reporting unit is allocated to its assets and liabilities in a manner similar to a purchase price allocation in order to determine the implied fair value of the reporting unit goodwill. If the carrying amount of the goodwill is greater than its implied fair value, the excess is recognized as an impairment loss.
	In 2014, the Company performed a qualitative assessment for the reporting unit other than the certain acquired entities. Based on the requirements of ASU 2011-08, the Company evaluated all relevant factors, weighed all factors in their entirety and concluded that it was not more-likely-than-not the fair value was less than the carrying amount of the this reporting unit, and further impairment testing on goodwill was unnecessary as of December 31, 2014. The Company elected to assess goodwill for impairment using the two-step process at two reporting units, representing the aforementioned acquired entities. The fair value of the two reporting units exceeded their respective carrying amount, and therefore goodwill related to these two reporting units were not impaired and the Company was not required to perform further testing.
	Intangible assets
	Intangible assets with finite lives are carried at cost less accumulated amortization. Land use rights are amortized using a straight-line method over the shorter of their estimated economic lives or the terms of related land use right contracts. All other intangible assets with finite lives are amortized using the straight-line method over the estimated economic lives.
	Intangible assets have weighted average economic lives from the date of purchase as follows:
	Land use rights	– 50 years
	Customer relationships	– 5.5 years
	Software	– 4.2 years
Trademarks	– 9.8 years
User list	– 3.4 years
Licensed copyrights of video contents	– 3.4 years
Others	– 5.9 years
Intangible assets with an indefinite useful life are not amortized and are tested for impairment annually or more frequently if events or changes in circumstances indicate that they might be impaired in accordance with ASC subtopic 350-30 (“ASC 350-30”),Intangibles-Goodwill and Other: General Intangibles Other than Goodwill.
Impairment of Long-Lived Assets Other Than Goodwill
The Company evaluates long-lived assets, such as fixed assets and purchased or internally developed intangible assets with finite lives, for impairment whenever events or changes in circumstances indicate the carrying value of an asset may not be recoverable in accordance with ASC topic 360 (“ASC 360”), Property, Plant and Equipment. When such events occur, the Company assesses the recoverability of the assets group based on the undiscounted future cash flow the assets group is expected to generate and recognizes an impairment loss when estimated undiscounted future cash flow expected to result from the use of the assets group plus net proceeds expected from disposition of the assets group, if any, is less than the carrying value of the assets group. If the Company identifies an impairment, the Company reduces the carrying amount of the assets group to its estimated fair value based on a discounted cash flow approach or, when available and appropriate, to comparable market values. The Company uses estimates and judgments in its impairment tests and if different estimates or judgments had been utilized, the timing or the amount of any impairment charges could be different. Asset groups to be disposed of would be reported at the lower of the carrying amount or fair value less costs to sell, and no longer depreciated. The assets and liabilities of a disposal group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheets.
Revenue Recognition
The Company recognizes revenue based on the following principles:
Performance-based online marketing services
Cost-per-click
The Company’s auction-based pay-for-performance (“P4P”) platform enables a customer to place its website link and related description on the Company’s search result list on the website which could be accessed through personal computer or mobile devices. Customers make bids on keywords based on how much they are willing to pay for each click to their listings in the search results listed on the Company’s website and the relevance between the keywords and the customer’s businesses. Internet users’ search of the keyword will trigger the display of the listings. The ranking of the customer’s listing depends on both the bidding price and the listing’s relevance to the keyword searched. Customer pays the Company only when a user clicks on one of its website links. Other than the auction-based P4P platform, the Company has certain vertical platforms from which it generates revenue through pre-determined prices per click. Revenue is recognized when a user clicks on one of the customer-sponsored website links, as there is persuasive evidence of an arrangement, the fee is fixed or determinable and collection is reasonably assured, as prescribed by ASC topic 605 (“ASC 605”), Revenue Recognition.
For certain customers engaged through direct sales, the Company may provide certain value-added consultative support services to help its customers to better utilize its online marketing system. Fees for such services are recognized as revenue on a pro-rata basis over the contracted service period.
Other performance-based online marketing services
To the extent the Company provides online marketing services based on performance criteria other than cost-per-lick, such as the number of successful reservation of hotels or issuance of air tickets, the number of downloads (and user registration) of mobile applications, the number of incremental end users and the total incremental revenue generated, revenue is recognized when the specified performance criteria are met together with satisfaction of other applicable revenue recognition criteria as prescribed by ASC 605.
Display-based online advertising services
For display-based online advertising services such as text links, banners, icons or other forms of graphical advertisements in the websites or mobile applications, the Company recognizes revenue in accordance with ASC 605, on a pro-rata basis over the contractual term for cost per time advertising arrangements commencing on the date the customer’s advertisement is displayed on a specified webpage or mobile applications, or on the number of times that the advertisement has been displayed for cost per thousand impressions advertising arrangements. For certain display-based contractual agreements, the Company may also provide certain performance guarantees, in which cases revenue is recognized at the later of the completion of the time commitment or performance guarantee.
Online game services and other revenue sharing services
The Company operates online game platforms on which registered users can access games provided by third-party game developers. The Company also operates mobile platforms on which users can access smartphone related products such as themes, wallpapers and e-books developed and owned by third-party content providers. The rights and obligations of each party to the arrangement indicate that the Company is acting as an agent whereas the game developer or the content provider is the principal as a result of being the primary obligor in the arrangement in accordance with ASC subtopic 605-45 (“ASC 605-45”), Revenue Recognition: Principal Agent Consideration. The Company recognizes the shared revenue from these online promotional services, on a net basis, based on the ratios pre-determined with the online game developers or content providers when all the revenue recognition criteria set forth in ASC 605 are met, which is generally when the user purchases virtual currencies issued by the game developers or purchases contents developed by the content providers.
Group buying services
The Company generates revenue from group buying services as a marketing agent by offering goods and services provided by third-party merchant partners at a discount through the website or mobile application that connects merchants to consumers. The Company presents revenue on a net basis, representing the amount billed to registered users less the amount paid to merchants, in accordance with ASC 605-45. The Company acts as an agent rather than as the principal in the delivery of the products or services as it does not assume the risks and rewards of ownership of products nor is it responsible for the actual fulfillment of services. Both of these are the responsibilities of the merchants. The Company recognizes revenue when all of the criteria prescribed in ASC 605 are met, which is generally when the merchants provide the services or when the products are delivered to the customers. Since the Company’s paying users have the ability to request for full refund before redemption for the products or services offered by the merchants, the underlying sale from which the Company earns the related commission revenue as an agent is not culminated until its paying users actually redeem.
Online marketing services involving Baidu Union
Baidu Union is the program through which the Company expands distribution of its customers’ sponsored links or advertisements by leveraging traffic of the Baidu Union members’ internet properties. The Company makes payments to Baidu Union members for acquisition of traffic. The Company recognizes gross revenue for the amount of fees it receives from its customers. Payments made to Baidu Union members are included in cost of revenues as traffic acquisition costs.
Barter transactions
The Company engages in barter transactions from time to time and in such situations follows the guidance set forth in ASC topic 845 (“ASC 845”), Nonmonetary Transactions. While nonmonetary transactions are generally recorded at fair value, if such value is not determinable within reasonable limits, or the transaction lacks commercial substance, or the transaction is an exchange of a product or property held for sale in the ordinary course of business for a product or property to be sold in the same line of business to facilitate sales to customers other than the parties to the exchange, the transaction is recognized based on the carrying value of the product or services provided. The Company also engages in certain advertising barter transactions and follows the guidance set forth in ASC subtopic 605-20 (“ASC 605-20”), Revenue Recognition: Services. The advertising barter transactions generally are recorded at fair value. If the fair value of the advertising surrendered in the barter transaction is not determinable within required limits, the barter transaction is recorded based on the carrying amount of the advertising surrendered, which likely to be zero. The amount of revenues recognized for barter transactions was insignificant for each of the years presented.
Other revenue recognition related policies
In accordance with ASC subtopic 605-25 (“ASC 605-25”), Revenue Recognition: Multiple-Deliverable Revenue Arrangements, for arrangements that include multiple deliverables, primarily for advertisements to be displayed in different spots, placed under different forms and occur at different time, the Company allocates the total consideration of the arrangements based on their relative selling price, with the selling price of each deliverable determined using vendor-specific objective evidence (“VSOE”) of selling price, third-party evidence (“TPE”) of selling price, or management’s best estimate of the selling price (“BESP”). The Company considers all reasonably available information in determining the BESP, including both market and entity-specific factors.
The Company delivers some of its online marketing services to end customers through engaging third-party distributors. In this context, the Company may provide cash incentives to distributors. The cash incentives are accounted for as reduction of revenue in accordance with ASC subtopic 605-50 (“ASC 605-50”), Revenue Recognition: Customer Payments and Incentives.
The Company provides sales incentives to customers to entitle customers to receive reductions in the price of the online marketing services by meeting certain cumulative consumption requirements. The Company accounts for these award credits granted to members in conjunction with a current sale of products or services as a multiple-element arrangement by analogy to ASC 605-25. The consideration allocated to the award credits, as deferred revenue, is based on an assumption that the customer will purchase the minimum amount of future service necessary to obtain the maximum award credits available. The deferred revenue is recognized as revenue proportionately as the future services are delivered to the customer or when the award credits expire.
Cash received in advance from customers is recorded as customer advances and deposits. The unused cash balances remaining in the customers’ accounts are included as liabilities of the Company. Deferred revenue is recorded when services are provided before the other revenue recognition criteria set forth in ASC 605 are fulfilled.
Cost of Revenues
Cost of revenues consists primarily of sales taxes (including business tax and output value-added tax) and surcharges, traffic acquisition costs, bandwidth costs, depreciation, content costs, payroll and related costs of operations.
The Company incurs sales taxes and surcharges in connection with the provision of online marketing services, technical and consultative service fees charged by its subsidiaries to VIEs and other taxable services in the PRC. In accordance with ASC 605-45, the Company includes the sales tax and surcharges incurred on its online marketing revenues in cost of revenues. The sales tax and surcharges in cost of revenues for the years ended December 31, 2012, 2013 and 2014 were RMB1.57 billion, RMB2.33 billion and RMB3.60 billion (US$579.85 million), respectively. Traffic acquisition costs represent the amounts paid or payable to Baidu Union members who direct search queries to the Company’s websites or distribute the Company’s customers’ paid links through their properties. These payments are primarily based on revenue sharing arrangements under which the Company pays its Baidu Union members and other business partners a percentage of the fees it earns from its online marketing customers.
Advertising Expenses
Advertising expenses, primarily advertisements through various forms of media, are included in “Selling, general and administrative expense” in the consolidated statements of comprehensive income and are expensed when incurred. Advertising expenses for the years ended December 31, 2012, 2013 and 2014 were RMB326.83 million, RMB191.61 million and RMB385.06 million (US$62.06 million), respectively.
Government Subsidies
Government subsidies primarily consist of financial subsidies received from provincial and local governments for operating a business in their jurisdictions and compliance with specific policies promoted by the local governments. There are no defined rules and regulations to govern the criteria necessary for companies to receive such benefits, and the amount of financial subsidy is determined at the discretion of the relevant government authorities. For the government subsidies with non-operating nature and with no further conditions to be met, the amounts are recorded as non-operating income in “Other income, net” when received; whereas for the government subsidies with certain operating conditions, the amounts are recorded as liabilities when received and will be recorded as operating income when the conditions are met.
Leases
Leases have been classified as either capital or operating leases. Leases that transfer substantially all the benefits and risks incidental to the ownership of assets are accounted for as capital leases as if there was an acquisition of an asset and incurrence of an obligation at the inception of the lease. All other leases are accounted for as operating leases wherein rental payments are expensed as incurred.
Income Taxes
The Company recognizes income taxes under the liability method. Deferred income taxes are recognized for differences between the financial reporting and tax bases of assets and liabilities at enacted tax rates in effect for the years in which the differences are expected to reverse. The Company records a valuation allowance against the amount of deferred tax assets that it determines is not more-likely-than-not to be realized. The effect on deferred taxes of a change in tax rates is recognized in earnings in the period that includes the enactment date.
The Company applies the provisions of ASC topic 740 (“ASC 740”), Income Taxes, in accounting for uncertainty in income taxes. ASC 740 clarified the accounting for uncertainty in income taxes by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The Company has elected to classify interest and penalties related to an uncertain tax position (if and when required) as part of income tax expense in the consolidated statements of comprehensive income. As of and for the years ended December 31, 2012, 2013 and 2014, the amounts of unrecognized tax benefits as well as interest and penalties associated with uncertainty in income taxes were insignificant.
Share-based Compensation
The Company accounts for share-based compensation in accordance with ASC topic 718 (“ASC 718”), Compensation-Stock Compensation. The Company has elected to recognize share-based compensation using the straight-line method for all share-based awards issued with no performance conditions. For awards with performance conditions, compensation cost is recognized on an accelerated basis if it is probable that the performance condition will be achieved.
Forfeitures have been estimated based on historical experience and are periodically reviewed. Cancellation of an award accompanied by the concurrent grant of a replacement award is accounted for as a modification of the terms of the cancelled award (“modification awards”). The compensation costs associated with the modification awards are recognized if either the original vesting condition or the new vesting condition has been achieved. Such compensation costs will not be less than the grant-date fair value of the original award. The incremental compensation cost is measured as the excess of the fair value of the replacement award over the fair value of the cancelled award at the cancellation date. Therefore, in relation to the modification awards, the Company recognizes share-based compensation over the vesting periods of the new options, which comprises, (i) the amortization of the incremental portion of share-based compensation over the remaining vesting term and (ii) any unrecognized compensation cost of original award, using either the original term or the new term, whichever results in higher expenses for each reporting period.
The Company accounts for share awards issued to non-employees in accordance with the provisions of ASC subtopic 505-50 (“ASC 505-50”), Equity: Equity-based payments to Non-Employees. The Company uses the Black-Scholes-Merton option pricing model method to measure the value of options granted to non-employees at each vesting date to determine the appropriate charge to share-based compensation. ASC 718 requires share-based compensation to be presented in the same manner as cash compensation rather than as a separate line item.
Earnings Per Share (“EPS”)
The Company computes earnings per Class A and Class B ordinary shares in accordance with ASC topic 260 (“ASC 260”), Earnings Per Share, using the two-class method. Under the provisions of ASC 260, basic net income per share is computed using the weighted average number of ordinary shares outstanding during the period except that it does not include unvested ordinary shares subject to repurchase or cancellation. The Company accounts for the accretion of the redeemable noncontrolling interests in the calculation of income available to ordinary shareholders of the Company used in the earnings per share calculation.
Diluted net income per share is computed using the weighted average number of ordinary shares and, if dilutive, potential ordinary shares outstanding during the period. Potentially dilutive securities have been excluded from the computation of diluted net income per share if their inclusion is anti-dilutive. Potential ordinary shares consist of the incremental ordinary shares issuable upon the exercise of stock options, restricted shares subject to forfeiture, and contracts that may be settled in the Company’s stock or cash. The dilutive effect of outstanding stock options and restricted shares is reflected in diluted earnings per share by application of the treasury stock method. The computation of the diluted net income per share of Class A ordinary shares assumes the conversion of Class B ordinary shares, while the diluted net income per share of Class B ordinary shares does not assume the conversion of such shares.
The liquidation and dividend rights of the holders of the Company’s Class A and Class B ordinary shares are identical, except with respect to voting rights. As a result, and in accordance with ASC 260, the undistributed earnings for each year are allocated based on the contractual participation rights of the Class A and Class B ordinary shares as if the earnings for the year had been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the conversion of Class B ordinary shares is assumed in the computation of the diluted net income per share of Class A ordinary shares, the undistributed earnings are equal to net income for that computation.
For the purposes of calculating the Company’s basic and diluted earnings per Class A and Class B ordinary shares, the ordinary shares relating to the options that were exercised are assumed to have been outstanding from the date of exercise of such options.
Contingencies
The Company records accruals for certain of its outstanding legal proceedings or claims when it is probable that a liability will be incurred and the amount of loss can be reasonably estimated. The Company evaluates, on a quarterly basis, developments in legal proceedings or claims that could affect the amount of any accrual, as well as any developments that would make a loss contingency both probable and reasonably estimable. The Company discloses the amount of the accrual if it is material.
When a loss contingency is not both probable and estimable, the Company does not record an accrued liability but discloses the nature and the amount of the claim, if material. However, if the loss (or an additional loss in excess of the accrual) is at least reasonably possible, then the Company discloses an estimate of the loss or range of loss, if such estimate can be made and material, or states that such estimate is immaterial if it can be estimated but immaterial, or discloses that an estimate cannot be made. The assessments of whether a loss is probable or reasonably possible, and whether the loss or a range of loss is estimable, often involve complex judgments about future events. Management is often unable to estimate the loss or a range of loss, particularly where (i) the damages sought are indeterminate, (ii) the proceedings are in the early stages, or (iii) there is a lack of clear or consistent interpretation of laws specific to the industry-specific complaints among different jurisdictions. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including eventual loss, fine, penalty or business impact, if any.
Concentration of Risks
Concentration of credit risk
Financial instruments that potentially subject the Company to significant concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, short-term investments, accounts receivable, amounts due from related parties and long-term held-to-maturity investments. As of December 31, 2014, the Company has RMB58.63 billion (US$9.45 billion) in cash and cash equivalents, restricted cash, short-term investments and long-term held-to-maturity investments, 86.37% and 13.63% of which are held by financial institutions in the PRC and international financial institutions outside of the PRC, respectively. The Company’s total cash and cash equivalents, restricted cash, short-term investments and long-term held-to-maturity investments held at China Merchants Bank and Bank of China exceeded 10%, representing 31.26% and 17.54% of the Company’s total cash and cash equivalents, restricted cash, short-term investments and long-term held-to-maturity investments as of December 31, 2014, respectively.
PRC state-owned banks, such as Bank of China, are subject to a series of risk control regulatory standards, and PRC bank regulatory authorities are empowered to take over the operation and management when any of those faces a material credit crisis. The Company does not foresee substantial credit risk with respect to cash and cash equivalents, restricted cash and short-term investments held at the PRC state-owned banks. Meanwhile, China does not have an official deposit insurance program, nor does it have an agency similar to what was the Federal Deposit Insurance Corporation (FDIC) in the U.S. In the event of bankruptcy of one of the financial institutions in which the Company has deposits or investments, it may be unlikely to claim its deposits or investments back in full. The Company selected reputable international financial institutions with high rating rates to place its foreign currencies. The Company regularly monitors the rating of the international financial institutions to avoid any potential defaults. There has been no recent history of default in relation to these financial institutions.
Accounts receivable are typically unsecured and derived from revenue earned from customers and agents in China, which are exposed to credit risk. The risk is mitigated by credit evaluations the Company performs on its customers and its ongoing monitoring process of outstanding balances. The Company maintains reserves for estimated credit losses and these losses have generally been within its expectations.
Amounts due from related parties are typically unsecured, interest-free and repayable on demand. In evaluating the collectability of the amounts due from related parties balance, the Company considers many factors, including the related parties’ repayment history and their credit-worthiness. An allowance for doubtful accounts is made when collection of the full amount is no longer probable.
Business and economic risks
The Company participates in a dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on the Company’s future financial position, results of operations or cash flows: changes in the overall demand for services and products; changes in business offerings; competitive pressures due to new entrants; advances and new trends in new technologies and industry standards; changes in bandwidth suppliers; changes in certain strategic relationships or customer relationships; regulatory considerations; copyright regulations; and risks associated with the Company’s ability to attract and retain employees necessary to support its growth.
No customer or any Baidu Union member generated greater than 10% of total revenues in any of the years presented.
The Company’s operations could be adversely affected by significant political, economic and social uncertainties in the PRC.
Currency convertibility risk
Substantially all of the Company’s businesses are transacted in RMB, which is not freely convertible into foreign currencies. All foreign exchange transactions take place either through the Bank of China or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the People’s Bank of China. Approval of foreign currency payments by the People’s Bank of China or other regulatory institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts.
Foreign currency exchange rate risk
The functional currency and the reporting currency of the Company are the US$ and RMB, respectively. The Company’s exposure to foreign currency exchange rate risk primarily relates to cash and cash equivalents, short-term investments and notes payable denominated in the US$. On June 19, 2010, the People’s Bank of China announced the end of the RMB’s de facto peg to the US$, a policy which was instituted in late 2008 in the face of the global financial crisis, to further reform the RMB exchange rate regime and to enhance the RMB’s exchange rate flexibility. On March 15, 2014, the People’s Bank of China announced the widening of the daily trading band for RMB against US$. The appreciation of the US$ against RMB was approximately 2.49% in 2014. Most of revenues and costs of the Company are denominated in RMB, while a portion of cash and cash equivalents and short-term financial assets are denominated in U.S. dollars. Any significant revaluation of RMB may materially and adversely affect the Company’s cash flows, revenues, earnings and financial position, and the value of, and any dividends payable on, the ADS in US$.
Derivative Instruments
ASC topic 815 (“ASC 815”), Derivatives and Hedging, requires all contracts which meet the definition of a derivative to be recognized on the balance sheet as either assets or liabilities and recorded at fair value. Changes in the fair value of derivative financial instruments are either recognized periodically in earnings or in other comprehensive income depending on the use of the derivative and whether it qualifies for hedge accounting. Changes in fair values of derivatives not qualified as hedges are reported in earnings. The estimated fair values of derivative instruments are determined at discrete points in time based on the relevant market information. These estimates are calculated with reference to the market rates using industry standard valuation techniques. The fair value of the derivative instruments held by the Company was insignificant for all years presented.
Recent Accounting Pronouncement
In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers. ASU 2014-09 supersedes the revenue recognition requirements in ASC 605, and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-09 on the consolidated financial statements.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combinations	3.    BUSINESS COMBINATIONS
	Business Combinations in 2014:
	During the year ended December 31, 2014, the Company completed several business combinations, which the Company expects to complement its existing businesses and achieve significant synergies. The acquired entities were considered insignificant, both individually and in aggregate. The results of the acquired entities’ operations have been included in the Company’s consolidated financial statements since their respective dates of acquisition.
	The Company has completed the valuations necessary to assess the fair values of the tangible and intangible assets acquired and liabilities assumed and the fair value of noncontrolling interests, resulting from which the amount of goodwill was determined and recognized as of the respective acquisition dates. The following table summarizes the estimated aggregate fair values of the assets acquired, liabilities assumed and the noncontrolling interests as of the respective dates of acquisition:
		RMB			US$
		(In thousands)
	Purchase consideration		398,410			64,212
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		(95,961	)		(15,466	)
	Intangible assets, net		249,452			40,204
	Deferred tax liabilities, noncurrent		(67,945	)		(10,951	)
	Pre-existing equity interests		(91,677	)		(14,776	)
	Noncontrolling interests		(150,000	)		(24,175	)
	Goodwill		554,541			89,376
	Goodwill, which is not tax deductible, is primarily attributable to the synergies expected to be achieved from the acquisitions.
	Neither the results of operations since the acquisition dates nor the pro forma results of operations of the acquirees were presented because the effects of these business combinations, individually and in the aggregate, were not significant to the Company’s consolidated results of operations.
	The valuations used in the purchase price allocation described above were determined by the Company with the assistance of independent third party valuation firms. The valuation reports considered generally accepted valuation methodologies such as the income, market and cost approaches. As the acquirees are all private companies, the fair value estimates of pre-existing equity method investments or noncontrolling interests are based on significant inputs that market participants would consider, which mainly include (a) discount rates, (b) a projected terminal values based on EBITDA, (c) financial multiples of companies in the same industries and (d) adjustments for lack of control or lack of marketability.
	Business Combinations in 2013:
	Acquisition of 91 Wireless
	On October 1, 2013, the Company acquired 100% of the outstanding ordinary shares of 91 Wireless Websoft Limited (“91 Wireless”), a leading Chinese mobile application marketplaces and mobile games operator, with which the Company expects to enhance its ability and market share in mobile online marketing business. The results of 91 Wireless’s operations have been included in the Company’s consolidated financial statements since October 1, 2013.
	Among the total purchase consideration, US$1.83 billion was paid upon the consummation of the acquisition and US$10.00 million was deposited in an escrow account in case of any breach of the representations and warranties made upon the acquisition or indemnifiable loss incurred, if any, such as claims, damages or penalties. The escrowed amount will be released and transferred to the original shareholders after a period of 18 months from the acquisition date. The remaining of the consideration represents the settlement of the pre-existing relationships between the Company and 91 Wireless, which was insignificant.
	The Company has completed the valuations necessary to assess the fair values of the tangible and intangible assets acquired and liabilities assumed, resulting from which the amount of goodwill was determined and recognized as of the acquisition date. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of October 1, 2013, the date of acquisition:
		RMB
		(In thousands)
	Purchase consideration		11,196,235
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		483,341
	Intangible assets, net		1,146,300
	Deferred tax liabilities, noncurrent		(278,346	)
	Goodwill		9,844,940
	Goodwill, which is not tax deductible, is primarily attributable to synergies expected to be achieved from the acquisition. The synergies are mainly attributable to the enhancement of the Company’s leading position on the rapidly emerging mobile area, especially the distribution of applications for mobile devices, which could better promote the Company’s products, reduce costs and expenses by sharing the infrastructure, distribution channel and common research and development results, and further foster an ecosystem with better user experience for mobile products, stronger user loyalty, and greater value for both customers and developers that enhance the Company’s monetization ability on the emerging mobile markets.
	Other acquisitions
	The Company also completed other business combinations during 2013, which the Company expects to complement its existing businesses and achieve significant synergies. The results of the acquired entities’ operations have been included in the Company’s consolidated financial statements since their respective dates of acquisition.
	The Company has completed the valuations necessary to assess the fair values of the tangible and intangible assets acquired and liabilities assumed and the fair value of noncontrolling interests, resulting from which the amount of goodwill was determined and recognized as of the respective acquisition dates. The following table summarizes the estimated aggregate fair values of the assets acquired, liabilities assumed and the noncontrolling interests as of the respective dates of acquisition:
		RMB
		(In thousands)
	Purchase consideration		3,865,378
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		467,159
	Intangible assets, net		796,415
	Deferred tax liabilities, noncurrent		(112,233	)
	Noncontrolling interests		(427,813	)
	Goodwill		3,141,850
	Goodwill, which is not tax deductible, is primarily attributable to the synergies expected to be achieved from the acquisitions.
	Business Combinations in 2012:
	During the year ended December 31, 2012, the Company completed several business combinations, which the Company expects to complement its existing businesses and achieve significant synergies. The acquired entities were considered insignificant, both individually and in aggregate. The results of the acquired entities’ operations have been included in the Company’s consolidated financial statements since their respective dates of acquisition.
	The Company has completed the valuations necessary to assess the fair values of the tangible and intangible assets acquired and liabilities assumed and the fair value of noncontrolling interests, resulting from which the amount of goodwill was determined and recognized as of the respective acquisition dates. The following table summarizes the estimated aggregate fair values of the assets acquired, liabilities assumed and the noncontrolling interests as of the respective date of acquisition:
		RMB
		(In thousands)
	Purchase consideration		1,190,717
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		91,095
	Intangible assets, net		664,380
	Deferred tax liabilities, noncurrent		(72,222	)
	Noncontrolling interests		(32,507	)
	Redeemable noncontrolling interests		(100,101	)
	Pre-existing equity method investments		(817,951	)
	Goodwill		1,458,023
	The aggregate purchase price allocation included the acquisitions of Qiyi.com, Inc (“Qiyi”) and certain other acquirees. Qiyi and one of the other acquirees were equity method investees of the Company prior to their respective acquisitions. The Company applied the equity method of accounting by recognizing its share of the profit or loss in these equity method investees up to their respective dates of acquisition.
	Goodwill, which is not tax deductible, is primarily attributable to the synergies expected to be achieved from the acquisitions.

Investments

Investments

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Investments

4.    INVESTMENTS

Short-term Investments

As of December 31, 2014, all of the held-to-maturity investments were time deposits in commercial banks with a maturity of less than one year. The available-for-sale investments are debt securities with a maturity of less than one year purchased from commercial banks and other financial institutions as well as equity securities in listed entities.

During the years ended December 31, 2012, 2013 and 2014, the Company recorded interest income from its short-term investments of RMB726.40 million, RMB1.07 billion and RMB1.81 billion (US$291.59 million) in the consolidated statements of comprehensive income, respectively.

Long-term Investments

The Company’s long-term investments consist of cost method investments, equity method investments, held-to-maturity investments with original and remaining maturities of greater than 12 months and available-for-sale investments.

Cost method investments

The carrying amount of cost method investments was RMB415.20 million and RMB1.72 billion (US$277.95 million) as of December 31, 2013 and 2014, respectively. The increase is primarily due to additional investments in 2014.

Equity method investments

As of December 31, 2013 and 2014, the Company holds several equity investments through its subsidiaries or VIEs, all of which were accounted for under the equity method since the Company can exercise significant influence but does not own a majority equity interest in or control them. These investments were not significant either individually or in aggregate. The carrying amount of equity method investments was RMB219.58 million and RMB219.84 million (US$35.43 million) as of December 31, 2013 and 2014, respectively.

Long-term held-to-maturity investments were time deposits in commercial banks with original and remaining maturities of greater than one year. The held-to-maturity investments are stated at amortized cost. Long-term available-for-sale equity investment represents investment in the equity securities of a publicly listed company. As the Company does not have significant influence over the investee, the investment was classified as available-for-sale and reported at fair value. Long-term available-for-sale debt investment represents investment in the redeemable preferred shares of a private company. As the preferred shares are redeemable at the option of the Company, the investment was classified as available-for-sale and measured at fair value.

The methodology used in the determination of fair values for held-to-maturity investments and available-for-sale investments were summarized in Note 21.

The total impairment charges on long-term investments were RMB169.18 million, RMB17.52 million and RMB93.42 million (US$15.06 million) for the years ended December 31, 2012, 2013 and 2014, respectively.

The short-term held-to-maturity debt investments as well as the short-term available-for-sale debt investments will mature within one year; whereas the long-term held-to-maturity debt investments as well as the long-term available-for-sale debt investments will mature after one year through five years.

As of December 31, 2013

Amortized

Gross

Gross

Gross

Fair

cost

unrecognized

unrecognized

unrealized

value

holding

holding

gains

gains

losses

RMB

RMB

RMB

RMB

RMB

(In thousands)

Short-term investments

Held-to-maturity investments

Fixed-rate investments

19,339,250

51,897

(21,080

)

19,370,067

Available-for-sale investments

Fixed-rate debt investments

7,603,087

24,871

7,627,958

Adjustable-rate debt investments

514,433

—

514,433

Equity investments

604,878

648,242

1,253,120

As of December 31, 2014

Amortized

Gross

Gross

Gross

Fair

Fair

cost

unrecognized

unrecognized

unrealized

value

value

holding

holding

gains(losses)

gains

losses

RMB

RMB

RMB

RMB

RMB

US$

(In thousands)

Short-term investments

Held-to-maturity investments

Fixed-rate investments

38,159,394

104,718

(15,389

)

38,248,723

6,164,575

Adjustable-rate investments

60,290

—

(771

)

59,519

9,593

Available-for-sale investments

Fixed-rate debt investments

2,854,682

10,414

2,865,096

461,770

Adjustable-rate debt investments

1,568,812

(269

)

1,568,543

252,803

Equity investments

630,919

533,795

1,164,714

187,718

Long-term investments:

Held-to-maturity investments

Fixed-rate investments

545,930

—

(14,612

)

531,318

85,633

Available-for-sale investments

Debt investment

272,680

—

272,680

43,948

Equity investment

124,000

(8,079

)

115,921

18,683

Accounts_Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Accounts Receivable	5.    ACCOUNTS RECEIVABLE
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Accounts receivable		2,264,660			3,758,324			605,732
	Allowance for doubtful accounts		(43,814	)		(93,877	)		(15,130	)
			2,220,846			3,664,447			590,602
	The movements in the allowance for doubtful accounts were as follows:
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Balance as of January 1		5,806			5,768			43,814			7,062
	Amounts (credited against) charged to expenses		(38	)		38,046			50,063			8,068
	Balance as of December 31		5,768			43,814			93,877			15,130

Other_Current_Assets

Other Current Assets	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	6.    OTHER CURRENT ASSETS
		As of December 31,
		2013		2014		2014
		RMB		RMB		US$
		(In thousands)
	Prepaid expenses		217,918		420,227		67,728
	Advances to suppliers		539,608		1,225,972		197,591
	Tax prepayments		266,630		323,618		52,158
	Receivable from online payment agencies		501,813		689,025		111,051
	Others		309,296		748,585		120,649
			1,835,265		3,407,427		549,177

Fixed_Assets

Fixed Assets	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Fixed Assets	7.    FIXED ASSETS
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Computer equipment		6,562,127			9,764,297			1,573,719
	Office building		911,482			1,776,651			286,344
	Office building related facility, machinery and equipment		158,174			577,178			93,024
	Vehicles		14,996			29,363			4,732
	Office equipment		242,065			342,452			55,193
	Leasehold improvements		234,180			311,076			50,136
	Construction in progress		1,199,086			1,783,641			287,471
			9,322,110			14,584,658			2,350,619
	Accumulated depreciation		(3,951,842	)		(5,879,294	)		(947,569	)
			5,370,268			8,705,364			1,403,050
	The Company obtained certain computer servers and equipment by entering into capital leases. The gross amount and the accumulated depreciation of these servers and equipment are RMB149.67 million and RMB59.46 million, respectively, as of December 31, 2013 and RMB224.03 million (US$36.11 million) and RMB122.43 million (US$19.73 million), respectively, as of December 31, 2014. Future minimum lease payments of RMB103.48 million are payable in the amounts of RMB57.32 million, RMB39.39 million, RMB6.77million, nil and nil in 2015, 2016, 2017, 2018 and 2019, respectively.
	Depreciation expense of the fixed assets, including assets under capital leases, was RMB1.20 billion, RMB1.64 billion and RMB2.19 billion (US$353.77 million) for the years ended December 31, 2012, 2013 and 2014, respectively. The Company recognized impairment loss on fixed assets of nil, RMB2.06 million and nil for the years ended December 31, 2012, 2013 and 2014, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	8.    GOODWILL AND INTANGIBLE ASSETS
	Goodwill
	The changes in the carrying amount of goodwill were as follows:
		2012			2013			2014		2014
		RMB			RMB			RMB		US$
		(In thousands)
	Balance as of January 1		2,419,542			3,877,564			16,864,350		2,718,040
	Goodwill acquired		1,458,023			12,986,790			554,541		89,376
	Foreign currency translation adjustment		(1	)		(4	)		4		—
	Balance as of December 31		3,877,564			16,864,350			17,418,895		2,807,416
	Intangible Assets
	Finite-lived intangible assets
		As of December 31, 2013
		Gross carrying			Accumulated			Net carrying
		value			amortization			value
		RMB			RMB			RMB
		(In thousands)
	Land use right		519,474			(26,968	)		492,506
	Customer relationships		682,715			(144,451	)		538,264
	Software		478,909			(152,711	)		326,198
	Trademarks		821,338			(97,122	)		724,216
	User list		789,975			(219,377	)		570,598
	Licensed copyrights of video contents		1,012,534			(469,787	)		542,747
	Others		496,439			(71,063	)		425,376
			4,801,384			(1,181,479	)		3,619,905
		As of December 31, 2014
		Gross carrying			Accumulated			Net carrying		Net
		value			amortization			value		carrying
										value
		RMB			RMB			RMB		US$
		(In thousands)
	Land use right		519,474			(37,357	)		482,117		77,703
	Customer relationships		693,712			(304,208	)		389,504		62,777
	Software		519,239			(274,818	)		244,421		39,394
	Trademarks		916,735			(189,588	)		727,147		117,195
	User list		854,467			(452,730	)		401,737		64,748
	Licensed copyrights of video contents		1,768,141			(935,238	)		832,903		134,239
	Others		695,562			(213,929	)		481,633		77,625
			5,967,330			(2,407,868	)		3,559,462		573,681
	The Company recognized impairment loss on intangible assets of nil, RMB4.62 million and RMB1.63 million (US$0.26 million) for the years ended December 31, 2012, 2013 and 2014, respectively. Amortization expense of intangible assets for the years ended December 31, 2012, 2013 and 2014 was RMB234.00 million, RMB949.85 million and RMB1.59 billion (US$255.48 million), respectively. Estimated amortization expense relating to the existing intangible assets with finite lives for each of the next five years is as follows:
		RMB			US$
		(In thousands)
	For the years ending December 31,
	2015		1,234,976			199,042
	2016		798,198			128,646
	2017		340,619			54,898
	2018		233,781			37,679
	2019		159,471			25,702
	Indefinite-lived intangible assets
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Domain names		9,360			9,360			1,509
	Trademarks		1,050			5,537			892
			10,410			14,897			2,401

Accounts_Payable_and_Accrued_L

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities	9.    ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
		As of December 31,
		2013		2014		2014
		RMB		RMB		US$
		(In thousands)
	Accrued payroll and welfare		759,952		1,703,029		274,478
	Accrued operating expenses		2,279,812		3,694,869		595,505
	Tax payable		428,801		624,781		100,696
	Interest payable		108,554		121,907		19,648
	Distributors’ deposits		76,925		171,791		27,688
	Purchase of fixed assets and spare parts		966,585		1,314,841		211,914
	Traffic acquisition costs		640,643		1,159,362		186,855
	Bandwidth costs		433,647		748,072		120,567
	Content acquisition costs		481,461		718,072		115,732
	Fund collected on behalf of service providers		438,211		1,563,564		252,001
	Payable to group-buying merchants		229,693		359,190		57,891
	Others		517,854		785,415		126,587
			7,362,138		12,964,893		2,089,562

Loans_Payable

Loans Payable	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Loans Payable	10.    LOANS PAYABLE
	Short-term Loans
	On May 13, 2014, 91 Wireless entered into a banking facility agreement with Hong Kong and Shanghai Banking Corporation Limited (Hong Kong branch) (“HSBC”), pursuant to which 91 Wireless is entitled to borrow a US$ denominated loan of RMB124.09 million (US$20.00 million) with an interest rate of 0.8% per annum over 1, 3 or 6 months LIBOR. The banking facility is subject to HSBC’s overriding right of repayment on demand and the loan under this facility is intended for the general working capital of 91 Wireless. On May 23, 2014, 91 Wireless drew down RMB43.40 million (US$7.00 million) with a fixed interest rate of 1.12% under the loan commitment, and on September 25, 2014, 91 Wireless drew down another RMB49.60 million (US$8.00 million) with a fixed interest rate of 1.13% under the loan commitment, both of which were secured by cash collateral of a subsidiary of 91 Wireless.
	Long-term Loans
	On September 18, 2012, the Company entered into a loan agreement with Australia and New Zealand Banking Group Limited (Hong Kong Branch), pursuant to which the Company is entitled to borrow an unsecured Australian Dollars (“AU$”) denominated loan with a floating interest rate. The loan commitment amounting to RMB532.46 million (AU$105.00 million) is intended for the general working capital of the Company. On October 17, 2012, the Company drew down RMB278.91 million (AU$55.00 million) with a term of two years under the loan commitment and the remaining commitment of AU$50.00 million was cancelled by both parties. In connection with the drawn down of the loan commitment, the Company entered into a currency swap agreement, pursuant to which the loan will be settled in a fixed US$ amount of US$56.76 million with a fixed annual interest rate of 2.75% during the term of the loan. The loan was fully repaid on October 16, 2014 when it became due.
	On July 24, 2013, the Company entered into a loan agreement with Sumitomo Mitsui Banking Corporation, pursuant to which the Company is entitled to borrow an unsecured US$ denominated loan of RMB930.69 million (US$150.00 million) with a floating interest rate. The loan is intended for the general working capital of the Company. On July 29, 2013, the Company drew down RMB930.69 million (US$150.00 million) with a term of two years under the facility commitment. In connection with the loan agreement, the Company entered into an interest swap agreement, pursuant to which the loan will be settled with a fixed annual interest rate of 1.17% during the term of the loan.
	On August 13, 2013, the Company entered into a loan agreement with Australia and New Zealand Banking Group Limited (Hong Kong Branch), pursuant to which the Company is entitled to borrow an unsecured AU$ denominated loan of RMB1.19 billion (AU$235.00 million) with a floating interest rate. The loan is intended for the general working capital of the Company. On August 19, 2013, the Company drew down RMB1.19 billion (AU$235.00 million) with a term of two years under the facility commitment. In connection with the loan agreement, the Company entered into a currency swap agreement, pursuant to which the loan will be settled in a fixed US$ amount of US$200.00 million with a fixed annual interest rate of 1.65% during the term of the loan.
	On December 9, 2014, the Company entered into two loan agreements with Bank of China (Los Angeles Branch), pursuant to which the Company borrowed two unsecured US denominated loans of RMB930.69 million (US$150.00 million) with a term of two years and RMB930.69 million (US$150.00 million) with a term of three years. Both loans are intended for the general working capital of the Company and have a floating interest rate. In connection with the loan agreements, the Company entered into two interest swap agreements, pursuant to which the loans will be settled with a fixed annual interest rate of 2.31% and 2.45%, respectively, during the respective term of the loans.
	The interest swap agreement and currency swap agreements met the definition of a derivative in accordance with ASC 815. The fair value of the derivatives related to the interest swap agreement and currency swap agreements was insignificant for the years ended December 31, 2013 and 2014.

Notes_Payable

Notes Payable	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Notes Payable	11.    NOTES PAYABLE
	On November 28, 2012, the Company issued and sold publicly two tranches of unsecured senior notes: (i) an aggregate principal amount of US$750.00 million which will mature on November 28, 2017 (the “2017 Notes”), and (ii) an aggregate principal amount of US$750.00 million which will mature on November 28, 2022 (the “2022 Notes”). On August 6, 2013, the Company issued and sold publicly another tranche of unsecured senior notes with an aggregate principal amount of US$1.00 billion which will mature on August 6, 2018 (the “2018 Notes”). On June 9, 2014, the Company issued and sold publicly the fourth tranche of unsecured senior notes with an aggregate principal amount of US$1.00 billion which will mature on June 9, 2019 (the “2019 Notes”). The 2017 Notes, 2018 Notes, 2019 Notes and 2022 Notes are collectively referred to as the “Notes”.
	The 2017 Notes bear interest at the rate of 2.25% per annum and the 2022 Notes bear interest at the rate of 3.50% per annum. Interests are payable semi-annually in arrears on and of each year, beginning on May 28, 2013. The 2018 Notes bear interest at the rate of 3.25% per annum. Interests are payable semi-annually in arrears on and of each year, beginning on February 6, 2014. The 2019 Notes bear interest at the rate of 2.75% per annum. Interests are payable semi-annually in arrears on and of each year, beginning on December 9, 2014. At maturity, the Notes are payable at their principal amount plus accrued and unpaid interest thereon.
	The net proceeds from the Notes, which will be used for general corporate purposes, were RMB9.33 billion, RMB6.11 billion and RMB6.19 billion (US$0.99 billion) for the years ended December 31, 2012, 2013 and 2014, respectively.
	The Notes do not contain any financial covenants or other significant restrictions. In addition, the Notes are unsecured and rank lower than any secured obligation of the Group and have the same liquidation priority as any other unsecured liabilities of the Group, but senior to those expressly subordinated obligations, if any. The Company may, at its discretion, redeem all or any portion of the Notes at any time, at the principal amount plus any unpaid interest. As of December 31, 2014, the Company does not intend to redeem any portion of the Notes prior to the stated maturity dates. The Company has the obligation to redeem the Notes if a change in control occurs as defined in the indenture of the Notes.
	The Notes were issued at a discount amounting to RMB62.84 million (US$10.13 million). The issuance costs of RMB109.63 million (US$17.67 million) were capitalized in other non-current assets on the consolidated balance sheets. Both the discount and the issuance costs are amortized as interest expense using the effective interest rate method through the maturity dates of the Notes. The effective interest rate was 2.36%, 3.39%, 3.00% and 3.59% for the 2017 Notes, the 2018 Notes, the 2019 Notes and the 2022 Notes, respectively.
	The following table summarizes the aggregate required repayments of the principal amounts of the Company’s long-term debts, including the notes payable and loans payable (Note 10), in the succeeding five years and thereafter:
		RMB		US$
		(In thousands)
	For the years ending December 31,
	2015		2,171,610		350,000
	2016		930,690		150,000
	2017		5,584,140		900,000
	2018		6,204,600		1,000,000
	2019		6,204,600		1,000,000
	Thereafter		4,653,450		750,000

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	12.    INCOME TAXES
	Cayman Islands and BVI
	Under the current laws of the Cayman Islands and BVI, the Company is not subject to tax on income or capital gains. Additionally, upon payments of dividends by the Company to its shareholders, neither Cayman Islands nor BVI withholding tax will be imposed.
	Hong Kong
	Under the Hong Kong tax laws, subsidiaries in Hong Kong are exempted from income tax on their foreign-derived income and there are no withholding taxes in Hong Kong on remittance of dividends.
	Japan
	Under the Japan tax laws, a company with paid-in capital in excess of JPY100.00 million is subject to national income tax of 30%. Japan subsidiaries of the Company are also subject to inhabitant tax, assessed by both prefectures and municipalities. Inhabitant tax is computed as a percentage of national income tax. The per capita tax is based on the Company’s capitalization and the number of employees. In addition, the Japan subsidiaries are subject to a corporate enterprise tax on a pro forma basis based on the amount of taxable profit subject to the corporate tax, added-value components, (e.g., labor costs, net interest and rental payments, income/loss for current year) and a capital component.
	China
	Under the Enterprise Income Tax (“EIT”) Law, which has been effective since January 1, 2008, domestic enterprises and Foreign Investment Enterprises (the “FIE”) are subject to a unified 25% enterprise income tax rate, except for certain entities that are entitled to tax holidays. Tax holidays mainly include preferential EIT rate for the PRC subsidiaries and VIEs which were recognized as a qualified “High and New Technology Enterprise” (“HNTE”) or “Key Software Enterprise” (“KSE”).
	The HNTE certificate is effective for a period of 3 years, during which the entity is entitled to a preferential tax rate of 15%. The KSE certificate is effective for a period of 2 years, during which the entity is entitled to a preferential tax rate of 10%. Baidu Online obtained the KSE certificate and the related tax holiday will expire on January 1, 2015; certain other PRC subsidiaries and VIEs, including Baidu Netcom, obtained the HNTE certificate which will expire on January 1, 2015, 2016 and 2017. An entity could re-apply for the HNTE or KSE certificate when the prior certificate expires. Historically, all of the Company’s subsidiaries and VIEs successfully re-applied for the certificates when the prior ones expired.
	A certificate for the current year might be obtained in the following year as a result of the stringent inspection and approval process by the governmental authorities. The Company would record an income tax reversal in the year when the certificate is obtained for the over-paid or over-accrued provisional tax in connection with the grant of a more favorable tax rate for the prior year.
	Under the current EIT Law, dividends paid by an FIE to any of its foreign non-resident enterprise investors are subject to a 10% withholding tax. Thus, the dividends, if and when payable by the Company’s PRC subsidiaries to their offshore parent entities, would be subject to 10% withholding tax. A lower tax rate will be applied if such foreign non-resident enterprise investor’s jurisdiction of incorporation has signed a tax treaty or arrangement for the avoidance of double taxation and the prevention of fiscal evasion with respect to taxes on income with China. There is such a tax arrangement between PRC and Hong Kong. Thus, the dividends, if and when payable by the Company’s PRC subsidiaries to the offshore parent entities located in Hong Kong, would be subject to 5% withholding tax rather than statutory rate of 10% provided that the offshore entities located in Hong Kong meet the requirements stipulated by relevant PRC tax regulations. Furthermore, pursuant to the applicable circular and interpretations of the current EIT Law, dividends from earnings created prior to 2008 but distributed after 2008 are not subject to withholding income tax.
	Moreover, the current EIT Law treats enterprises established outside of China with “effective management and control” located in China as PRC resident enterprises for tax purposes. The term “effective management and control” is generally defined as exercising overall management and control over the business, personnel, accounting, properties, etc. of an enterprise. The Company, if considered a PRC resident enterprise for tax purposes, would be subject to the PRC Enterprise Income Tax at the rate of 25% on its worldwide income for the period after January 1, 2008. As of December 31, 2014, the Company has not accrued for PRC tax on such basis. The Company will continue to monitor its tax status.
	The Company had minimal operations in jurisdictions other than the PRC. Income (loss) before income taxes consists of:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	PRC		12,537,331			13,815,469			17,783,174			2,866,128
	Non-PRC		(571,894	)		(1,630,453	)		(3,308,631	)		(533,254	)
			11,965,437			12,185,016			14,474,543			2,332,874
	The pre-tax losses from non-PRC operations consist primarily of operating costs, administration expenses, interest expenses and share-based compensation expenses.
	Income taxes consist of:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Current income tax		1,888,378			2,006,980			2,942,173			474,192
	Income tax refund due to reduced tax rate		(255,189	)		(508,686	)		(17,553	)		(2,829	)
	Adjustments of deferred tax assets due to reduced tax rates		—			21,573			28,146			4,536
	Deferred income tax (benefit) expense		(59,030	)		309,063			(721,594	)		(116,300	)
			1,574,159			1,828,930			2,231,172			359,599
	The reconciliation of the effective income tax provision to the amount of tax computed by applying the aforementioned statutory income tax rate to pre-tax income is as follows:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands, except for per share data)
	Expected taxation at PRC EIT statutory rate		2,991,359			3,046,254			3,587,693			578,231
	Effect of differing tax rates in different jurisdictions		138,931			312,938			676,663			109,058
	Permanent differences – non-taxable income		(58,157	)		(69,673	)		(12,504	)		(2,015	)
	Permanent differences – non-deductible expenses		58,201			168,735			123,245			19,864
	Tax incentives relating to research and development expenditures		(154,977	)		(318,652	)		(538,305	)		(86,759	)
	Effect of preferential tax rates inside the PRC		(1,489,331	)		(2,152,806	)		(1,897,184	)		(305,771	)
	Effect of tax rate changes on deferred taxes		—			21,573			28,146			4,536
	Over-accrued EIT for previous years		(15,084	)		(32,982	)		(153,121	)		(24,679	)
	Withholding tax on PRC subsidiaries’ undistributed earnings		—			560,243			—			—
	Addition to valuation allowance		103,217			293,300			416,539			67,134
	Taxation for the year		1,574,159			1,828,930			2,231,172			359,599
	Effective tax rate		13.16	%		15.01	%		15.41	%		15.41	%
	Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share		42.63			61.53			53.61			8.64
	The Company’s effective tax rate increased slightly in year 2014 as compared with year 2013 which was primarily due to more taxable earnings in subsidiaries without preferential tax rates.
	The tax effects of temporary differences that give rise to the deferred tax balances at December 31, 2013 and 2014 are as follows:
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Deferred tax assets, current:
	Provision for doubtful receivables		10,670			23,179			3,736
	Net operating loss carry-forward		—			24,666			3,975
	Accrued expenses, payroll and others		316,092			777,478			125,307
	Less: valuation allowance		(39,918	)		(140,371	)		(22,624	)
	Current deferred tax assets, net		286,844			684,952			110,394
	Deferred tax assets, non-current:
	Fixed assets depreciation		28,755			38,157			6,150
Net operating loss carry-forward		580,963			905,790			145,987
Advertising expenses and others		163,591			306,635			49,420
Less: valuation allowance		(675,369	)		(991,455	)		(159,793	)
Non-current deferred tax assets, net		97,940			259,127			41,764
	As of December 31,
	2013			2014			2014
	RMB			RMB			US$
	(In thousands)
Long-lived assets arising from acquisitions		619,550			549,485			88,561
Withholding tax on PRC subsidiaries’ undistributed earnings		580,720			594,336			95,789
Deferred tax liabilities		1,200,270			1,143,821			184,350
As of December 31, 2014, the Company had net operating losses of approximately RMB5.22 billion (US$842.09 million) deriving from entities in the PRC, Hong Kong and Japan, which can be carried forward after certain reconciliation per tax regulation to offset future net profit for income tax purposes. The Japan net operating loss will expire beginning January 1, 2015; the PRC net operating loss will expire beginning January 1, 2017; and the Hong Kong net operating loss can be carried forward without an expiration date.
For those entities that were in an accumulated loss position, the Company does not believe there exists sufficient objective positive evidence that the recoverability of their net deferred tax assets is more-likely-than-not to be realized. Consequently, the Company has provided full valuation allowances on the related net deferred tax assets.
The Company has evaluated its income tax uncertainty under ASC 740. ASC 740 clarifies the accounting for uncertainty in income taxes by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The Company has elected to classify interest and penalties related to an uncertain tax position, if and when required, as part of income tax expense in the consolidated statements of comprehensive income. As of and for the years ended December 31, 2013 and 2014, there was no significant tax uncertainty impact on the Company’s financial position and result of operations.
The Company accrued withholding tax of RMB580.72 million for the potential remittance of earnings from the PRC subsidiaries to their offshore parent companies in the form of dividend distribution as of December 31, 2013, because the Company believes that the underlying dividends will be distributed in the future considering future merger and acquisition activities. The Company did not provide for additional deferred income taxes and foreign withholding taxes on the undistributed earnings of foreign subsidiaries in 2014 on the basis of its intent to permanently reinvest foreign subsidiaries’ earnings. If these foreign earnings were to be repatriated in the future, the related tax liability may be reduced by any foreign income taxes previously paid on these earnings. As of December 31 2014, the total amount of undistributed earnings from the PRC subsidiaries for which no withholding tax has been accrued was RMB49.44 billion (US$7.97 billion). Determination of the amount of unrecognized deferred tax liability related to these earnings is not practicable. In the case of its VIEs, undistributed earnings were insignificant as of each of the balance sheet dates.
In general, the PRC and Japanese tax authorities have up to five and seven years, respectively, to conduct examinations of the Company’s tax filings. Accordingly, the PRC subsidiaries’ tax years 2010 through 2014 and the Japanese subsidiary’s tax years 2008 through 2014 remain open to examination by the respective taxing jurisdictions.

Employee_Defined_Contribution_

Employee Defined Contribution Plan	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Defined Contribution Plan	13.    EMPLOYEE DEFINED CONTRIBUTION PLAN
	Full time employees of the Group in the PRC participate in a government mandated multi-employer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. Chinese labor regulations require that the Group make contributions to the government for these benefits based on certain percentages of the employees’ salaries. The Company has no legal obligation for the benefits beyond the contributions. The total amounts for such employee benefits, which were expensed as incurred, were RMB631.25 million, RMB1.05 billion and RMB1.64 billion (US$263.86 million) for the years ended December 31, 2012, 2013 and 2014, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	14.    COMMITMENTS AND CONTINGENCIES
	Capital Commitments
	The Company’s capital commitments primarily relate to commitments in connection with the expansion and improvement of its network infrastructure and its plan to build additional office buildings and cloud computing based data centers. Total capital commitments contracted but not yet reflected in the financial statements amounted to RMB1.13 billion (US$182.12 million) as of December 31, 2014. All of the commitments relating to the network infrastructure are to be fulfilled in 2015 and the commitments relating to the office building and cloud computing based data centers will be settled in installments as various stages of the construction plan are completed in the next four to six years.
	Operating Lease Commitments
	The Company leases facilities in the PRC under non-cancelable operating leases expiring on different dates. Payments under operating leases are expensed on a straight-line basis over the periods of the respective leases. Total rental expense for offices was RMB196.59 million, RMB284.58 million and RMB525.31 million (US$84.66 million) for the years ended December 31, 2012, 2013 and 2014, respectively. Total operating lease expense for Internet Data Centre (“IDC”) facilities was RMB1.07 billion, RMB1.94 billion and RMB2.85 billion (US$459.34 million) for the years ended December 31, 2012, 2013 and 2014, respectively.
	Future minimum payments under non-cancelable operating leases with initial terms of one-year or more consist of the following as of December 31, 2014:
		RMB		US$
		(In thousands)
	2015		2,418,879		389,853
	2016		1,160,152		186,983
	2017		748,230		120,593
	2018		593,102		95,591
	2019		291,077		46,913
	Thereafter		170,008		27,400
			5,381,448		867,333
	The Group’s lease arrangements have no renewal options, rent escalation clauses, restriction or contingent rents and are all conducted with third parties.
	Commitments for Licensed Copyrights
	The Company enters into non-cancelable licensing agreements with third-party vendors to acquire licensed copyrights of video contents for its online video platform. Payments for licensed copyrights of video contents are recorded in “Other current assets, net/Intangible assets, net” on the consolidated balance sheets.
	Future minimum payments under non-cancelable licensing agreements consist of the following as of December 31, 2014:
		RMB		US$
		(In thousands)
	2015		2,154,666		347,269
	2016 and thereafter		—		—
			2,154,666		347,269
	Guarantees
	The Company accounts for guarantees in accordance with ASC topic 460 (“ASC 460”), Guarantees. Accordingly, the Company evaluates its guarantees if any to determine whether (a) the guarantee is specifically excluded from the scope of ASC 460, (b) the guarantee is subject to ASC 460 disclosure requirements only, but not subject to the initial recognition and measurement provisions, or (c) the guarantee is required to be recorded in the financial statements at fair value.
	The corporate by-laws require that the Company indemnify its officers and directors, as well as those who act as directors and officers of other entities at the Company’s request, against expenses, judgments, fines, settlements and other amounts actually and reasonably incurred in connection with any proceedings arising out of their services to the Company. In addition, the Company has entered into separate indemnification agreements with each director and each executive officer of the Company that provide for indemnification of these directors and officers under similar circumstances and under additional circumstances. The indemnification obligations are more fully described in the by-laws and the indemnification agreements. The Company purchases standard directors and officers insurance to cover claims or a portion of the claims made against its directors and officers. Since a maximum obligation is not explicitly stated in the Company’s by-laws or in the indemnification agreements and will depend on the facts and circumstances that arise out of any future claims, the overall maximum amount of the obligations cannot be reasonably estimated.
	Historically, the Company was not required to make payments related to these obligations, and the fair value for these obligations is nil on the consolidated balance sheets as of December 31, 2013 and 2014.
	Litigation
	The Group was involved in certain cases pending in various PRC and U.S. courts and arbitration as of December 31, 2014. These cases include copyright infringement cases, unfair competition cases, and defamation cases, among others. Adverse results in these lawsuits may include awards of damages and may also result in, or even compel, a change in the Company’s business practices, which could result in a loss of revenue or otherwise harm the business of the Company.
	For many proceedings, the Company is currently unable to estimate the reasonably possible loss or a range of reasonably possible losses as the proceedings are in the early stages, and/or there is a lack of clear or consistent interpretation of laws specific to the industry-specific complaints among different jurisdictions. As a result, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, which includes eventual loss, fine, penalty or business impact, if any, and therefore, an estimate for the reasonably possible loss or a range of reasonably possible losses cannot be made. However, the Company believes that such matters, individually and in the aggregate, when finally resolved, are not reasonably likely to have a material adverse effect on the Company’s consolidated results of operations, financial position and cash flows. With respect to the limited number of proceedings for which the Company was able to estimate the reasonably possible losses or the range of reasonably possible losses, such estimated loss amounts were insignificant.

Redeemable_Noncontrolling_Inte

Redeemable Noncontrolling Interests	12 Months Ended
	Dec. 31, 2014
Temporary Equity Disclosure [Abstract]
Redeemable Noncontrolling Interests	15.    REDEEMABLE NONCONTROLLING INTERESTS
			2012			2013			2014
			RMB			RMB			RMB		US$
			(In thousands)
	Balance as of January 1			935,978			1,033,283			—		—
	Business combination			100,101			—			—		—
	Net losses			(55,804	)		(61,857	)		—		—
	Other comprehensive losses			(690	)		(55,420	)		—		—
	Exercise of share-based awards			—			464			—		—
	Share-based compensation			5,566			11,259			—		—
	Issuance of subsidiary shares (1)			25,989			51,368			1,841,819		296,845
	Accretion of redeemable noncontrolling interests (1)			22,143			31,799			52,683		8,493
	Acquisition of subsidiaries’ redeemable shares from noncontrolling shareholders			—			(121,962	)		—		—
	Reclassification of redeemable noncontrolling interests			—			(888,934	)		—		—
	Balance as of December 31			1,033,283			—			1,894,502		305,338
	-1	On November 14, 2014, Qiyi completed a round of preferred shares financing. The new preferred shareholders acquired 13.42% of the then outstanding equity interest of Qiyi for a total consideration of US$300 million. The newly issued preferred shares could be redeemed by such shareholders upon the occurrence of certain events that are not solely within the control of Qiyi and are accounted for as redeemable noncontrolling interests. The Company accounts for the accrete changes in the redemption value in accordance with ASC topic 480 (“ASC 480”), Distinguishing Liabilities from Equity. The Company elects to use the effective interest method for the changes of redemption value over the period from the date of issuance to the earliest redemption date of the noncontrolling interest.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Shareholders' Equity	16.    SHAREHOLDERS’ EQUITY
	Ordinary Shares
	The authorized share capital consisted of 870,400,000 ordinary shares at a par value of US$0.00005 per share, of which 825,000,000 shares were designated as Class A ordinary shares, 35,400,000 as Class B ordinary shares, and 10,000,000 shares designated as preferred shares. The rights of the holders of Class A and Class B ordinary shares are identical, except with respect to voting and conversion rights. Each share of Class A ordinary shares is entitled to one vote per share and is not convertible into Class B ordinary shares under any circumstances. Each share of Class B ordinary shares is entitled to ten votes per share and is convertible into one Class A ordinary share at any time by the holder thereof. Upon any transfer of Class B ordinary shares by the holder thereof to any person or entity that is not an affiliate of such holder, such Class B ordinary shares would be automatically converted into an equal number of Class A ordinary shares. There were 40,000, 225,079 and 45,000 Class B ordinary shares transferred to Class A ordinary shares in the years ended December 31, 2012, 2013 and 2014, respectively.
	As of December 31, 2014, there were 27,613,315 and 7,492,921 Class A and Class B ordinary shares outstanding, respectively. As of December 31, 2013 and 2014, there were no preferred shares issued and outstanding.
	Retained Earnings
	In accordance with the Regulations on Enterprises with Foreign Investment of China and their articles of association, the Company’s PRC subsidiaries, being foreign invested enterprises established in China, are required to make appropriations to certain statutory reserves, namely a general reserve fund, an enterprise expansion fund, a staff welfare fund and a bonus fund, all of which are appropriated from net profit as reported in their PRC statutory accounts. Each of the Company’s PRC subsidiaries is required to allocate at least 10% of its after-tax profits to a general reserve fund until such fund has reached 50% of its respective registered capital. Appropriations to the enterprise expansion fund and staff welfare and bonus funds are at the discretion of the Company’s subsidiaries.
	In accordance with the China Company Laws, the Company’s VIEs must make appropriations from their after-tax profits as reported in their PRC statutory accounts to non-distributable reserve funds, namely a statutory surplus fund, a statutory public welfare fund and a discretionary surplus fund. Each of the Company’s VIEs is required to allocate at least 10% of its after-tax profits to the statutory surplus fund until such fund has reached 50% of its respective registered capital. Appropriations to the statutory public welfare fund and the discretionary surplus fund are made at the discretion of the Company’s VIEs.
	General reserve and statutory surplus funds are restricted to set-off against losses, expansion of production and operation and increasing registered capital of the respective company. Staff welfare and bonus fund and statutory public welfare funds are restricted to capital expenditures for the collective welfare of employees. The reserves are not allowed to be transferred to the Company in terms of cash dividends, loans or advances, nor are they allowed for distribution except under liquidation.
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	PRC statutory reserve funds		321,206			375,193			60,470
	Unreserved retained earnings		34,204,180			47,284,579			7,620,891
	Total retained earnings		34,525,386			47,659,772			7,681,361
	Under PRC laws and regulations, there are restrictions on the Company’s PRC subsidiaries and VIEs with respect to transferring certain of their net assets to the Company either in the form of dividends, loans, or advances. Amounts of net assets restricted include paid in capital and statutory reserve funds of the Company’s PRC subsidiaries and the net assets of the VIEs in which the Company has no legal ownership, totaling RMB3.72 billion and RMB7.54 billion (US$1.22 billion) as of December 31, 2013 and 2014, respectively.
	Furthermore, cash transfers from the Company’s PRC subsidiaries to their parent companies outside of China are subject to PRC government control of currency conversion. Shortages in the availability of foreign currency may restrict the ability of the PRC subsidiaries and consolidated affiliated entities to remit sufficient foreign currency to pay dividends or other payments to the Company, or otherwise satisfy their foreign currency denominated obligations.
	Accumulated Other Comprehensive Income (Loss)
	The changes in accumulated other comprehensive income (loss) by component, net of tax, were as follows:
		Foreign			Unrealized			Total
		currency			gains on
		translation			available-for-
		adjustment			sale
					investments
		RMB			RMB			RMB
		(In thousands)
	Balance at December 31, 2012		(89,714	)		11,436			(78,278	)
	Other comprehensive income before reclassification		190,322			730,504			920,826
	Amounts reclassified from accumulated other comprehensive income		—			(62,132	)		(62,132	)
	Net current-period other comprehensive income		190,322			668,372			858,694
	Other comprehensive income attribute to noncontrolling interests		62,680			—			62,680
	Balance at December 31, 2013		163,288			679,808			843,096
	Other comprehensive loss before reclassification		(445,710	)		(100,285	)		(545,995	)
	Amounts reclassified from accumulated other comprehensive income		—			(45,025	)		(45,025	)
	Net current-period other comprehensive loss		(445,710	)		(145,310	)		(591,020	)
	Other comprehensive income attribute to noncontrolling interests		(20,153	)		—			(20,153	)
	Balance at December 31, 2014		(302,575	)		534,498			231,923
	Balance at December 31, 2014, in US$		(48,766	)		86,145			37,379
	The amounts reclassified out of accumulated other comprehensive income represent realized gains on the available-for-sale investments upon their sales, which were then recorded in “Other income, net” in the consolidated statements of comprehensive income.
	The following table sets forth the tax effect allocated to each component of other comprehensive income for the years ended December 31, 2013 and 2014:
		Tax effect
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Unrealized gains on available-for-sale investments
	Unrealized holding gains during the year		(1,157	)		1,680			271
	Reclassified for gains realized		—			—			—
	Net unrealized gains		(1,157	)		1,680			271
	Foreign currency translation adjustment		—			—			—
	Other comprehensive income (loss)		(1,157	)		1,680			271

Earnings_Per_Share_EPS

Earnings Per Share ("EPS")	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share ("EPS")	17.    EARNINGS PER SHARE (“EPS”)
	A reconciliation of net income attributable to Baidu, Inc. in the consolidated statements of comprehensive income to the numerator for the computation of basic and diluted per share for the years ended December 31, 2012, 2013 and 2014 is as follows:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Net income attributable to Baidu, Inc.		10,456,028			10,518,966			13,187,069			2,125,372
	Accretion of the redeemable noncontrolling interests		(22,143	)		(31,799	)		(52,683	)		(8,493	)
	Numerator for EPS computation		10,433,885			10,487,167			13,134,386			2,116,879
	The following table sets forth the computation of basic and diluted net income attributable to Baidu, Inc. per share for Class A and Class B ordinary shares.
		For the years ended December 31,
		2012						2013						2014
		Class A			Class B			Class A			Class B			Class A		Class A		Class B		Class B
		RMB			RMB			RMB			RMB			RMB		US$		RMB		US$
		(In thousands, except for number of shares, per share and per ADS data)
	Earnings per share – basic:
	Numerator
	Allocation of net income attributable to Baidu, Inc.		8,106,219			2,327,666			8,175,647			2,311,520			10,320,767		1,663,406		2,813,619		453,473
	Denominator
	Weighted average ordinary shares outstanding		27,145,208			7,794,630			27,274,769			7,711,459			27,551,463		27,551,463		7,511,003		7,511,003
	Denominator used for earnings per share		27,145,208			7,794,630			27,274,769			7,711,459			27,551,463		27,551,463		7,511,003		7,511,003
	Earnings per share – basic		298.62			298.62			299.75			299.75			374.6		60.37		374.6		60.37
	Earnings per share – diluted:
	Numerator
	Allocation of net income attributable to Baidu, Inc. for diluted computation		8,108,856			2,325,029			8,178,954			2,308,213			10,331,639		1,665,158		2,802,747		451,721
	Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares		2,325,029			—			2,308,213			—			2,802,747		451,721		—		—
	Allocation of net income attributable to Baidu, Inc.		10,433,885			2,325,029			10,487,167			2,308,213			13,134,386		2,116,879		2,802,747		451,721
	Denominator
	Weighted average ordinary shares outstanding		27,145,208			7,794,630			27,274,769			7,711,459			27,551,463		27,551,463		7,511,003		7,511,003
	Conversion of Class B to Class A ordinary shares		7,794,630			—			7,711,459			—			7,511,003		7,511,003		—		—
	Share-based awards		39,621			—			50,118			—			136,008		136,008		—		—
	Denominator used for earnings per share		34,979,459			7,794,630			35,036,346			7,711,459			35,198,474		35,198,474		7,511,003		7,511,003
	Earnings per share – diluted		298.29			298.29			299.32			299.32			373.15		60.14		373.15		60.14
	Earnings per ADS:
	Denominator used for earnings per ADS – basic		271,452,080						272,747,690						275,514,630		275,514,630
	Denominator used for earnings per ADS – diluted		349,794,590						350,363,460						351,984,740		351,984,740
	Earnings per ADS – basic		29.86						29.98						37.46		6.04
	Earnings per ADS – diluted		29.83						29.93						37.32		6.01
	The Company did not include certain stock options and restricted shares in the computation of diluted earnings per share for the years ended December 31, 2012, 2013 and 2014 because those stock options and restricted shares were anti-dilutive for earnings per share for the respective years.

ShareBased_Awards_Plan

Share-Based Awards Plan	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Awards Plan	18.    SHARE-BASED AWARDS PLAN
	Baidu, Inc.
	Incentive compensation plans
	In December 2008, the Company adopted a share incentive plan (the “2008 Plan”), which provides for the granting of share incentives, including incentive share option (“ISO”), restricted shares and any other form of award pursuant to the 2008 Plan, to members of the board, employees and consultants of the Company. However, the Company may grant ISOs only to its employees. The Company has reserved 3,428,777 ordinary shares for issuance under the 2008 Plan, which will expire in the year 2018. The vesting schedule, time and condition to exercise options will be determined by the compensation committee. The term of the options may not exceed ten years from the date of the grant, except that five years is the maximum term of an ISO granted to an employee who holds more than 10% of the voting power of the Company’s share capital.
	Under the 2008 Plan, share options are subject to vesting schedules varying from two years to four years, the exercise price of an option may be amended or adjusted at the discretion of the compensation committee, the determination of which would be final, binding and conclusive. To the extent not prohibited by applicable laws or exchange rules, a downward adjustment of the exercise prices would be effective without the approval of the Company’s shareholders or the approval of the affected grantees. If the Company grants an ISO to an employee who, at the time of that grant, owns shares representing more than 10% of the voting power of all classes of the Company’s share capital, the exercise price cannot be less than 110% of the fair market value of the Company’s ordinary shares on the date of that grant.
	Starting from February 15, 2006, the Company granted restricted Class A ordinary shares of the Company (“Restricted Shares”). Terms for the Restricted Shares are the same as share options except that Restricted Shares do not require exercise and have a two to four years vesting term.
	Share options
	The following table summarizes the option activity for the year ended December 31, 2014:
		Number			Weighted		Weighted		Aggregate
		of shares			average		average		intrinsic
					exercise		remaining		value (US$ in
					price		contractual		thousands)
					(US$)		life (Years)
	Share options
	Outstanding, December 31, 2013		232,572			1,042.90		8.62		171,156
	Granted		19,477			1,916.10
	Exercised		(30,819	)		942.1
	Forfeited/Cancelled		(22,838	)		1,071.40
	Outstanding, December 31, 2014		198,392			1,141.00		7.83		225,915
	Vested and expected to vest at December 31, 2014		171,597			1,139.30		7.8		195,684
	Exercisable at December 31, 2014		66,993			1,003.30		7.14		85,509
	The aggregate intrinsic value in the table above represents the difference between the Company’s closing stock price on the last trading day in 2014 and the exercise price.
	Total intrinsic value of options exercised for the years ended December 31, 2012, 2013 and 2014 was RMB200.91 million, RMB114.21 million and RMB224.80 million (US$36.23 million), respectively. The total fair value of options vested during the years ended December 31, 2012, 2013 and 2014 was RMB53.56 million, RMB123.44 million and RMB149.22 million (US$24.05 million), respectively.
	As of December 31, 2014, there was RMB273.44 million (US$44.07 million) unrecognized share-based compensation cost related to share options. That deferred cost is expected to be recognized over a weighted-average vesting period of 2.35 years. To the extent the actual forfeiture rate is different from the original estimate, actual share-based compensation costs related to these awards may be different from expectation.
	The fair value of each option award was estimated on the date of grant using the Black-Scholes-Merton valuation model. The volatility assumption was estimated based on implied volatility and historical volatility of the Company’s share price applying the guidance provided by ASC 718. The Company begins to estimate the volatility assumption solely based on its historical information since year 2009. Assumptions of the expected term were based on the vesting and contractual terms and employee demographics. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant.
	The following table presents the assumptions used to estimate the fair values of the share options granted in the years presented:
		2012			2013		2014
	Risk-free interest rate		0.35%~0.43%			0.40%~1.35%		1.52%~1.77%
	Dividend yield		—			—		—
	Expected volatility range		43.60%~44.72%			42.33%~44.17%		40.96%~41.59%
	Weighted average expected volatility		43.75%			43.33%		41.36%
	Expected life (in years)		2.67~3.08			3.08~4.57		4.57
	In addition, the Company recognizes share-based compensation expense net of an estimated forfeiture rate and therefore only recognizes compensation cost for those shares expected to vest over the service period of the award. The estimation of the forfeiture rate is primarily based on historical experience of employee turnover. To the extent the Company revises this estimate in the future, the share-based payments could be materially impacted in the year of revision, as well as in the following years.
	The exercise price of options granted during the years 2012, 2013 and 2014 equaled the market price of the ordinary shares on the grant date. The weighted-average grant-date fair value of options granted during the years 2012, 2013, and 2014 was US$323.00, US$419.80, and US$755.00, respectively.
	Restricted shares
	Restricted shares activity for the year ended December 31, 2014 was as follows:
		Number of			Weighted
		shares			average grant
					date fair
					value (US$)
	Restricted shares
	Unvested, December 31, 2013		146,510			1,151.40
	Granted		152,852			1,815.60
	Vested		(45,161	)		1,157.70
	Forfeited		(34,797	)		1,346.10
	Unvested, December 31, 2014		219,404			1,582.60
	The total fair value of the restricted shares vested during the years ended December 31, 2012, 2013 and 2014 was RMB128.70 million, RMB247.24 million, RMB324.41 million (US$52.28 million), respectively. The weighted-average grant-date fair value of the restricted shares granted during the years 2012, 2013, and 2014 was US$1,152.10, US$1,137.00, and US$1,815.60, respectively.
	As of December 31, 2014, there was RMB1.35 billion (US$217.84 million) unrecognized share-based compensation cost related to restricted shares. That deferred cost will be recognized over a weighted-average vesting period of 3.02 years. To the extent the actual forfeiture rate is different from the original estimate, actual share-based compensation costs related to these awards may be different from expectation.
	Subsidiaries – Qunar Cayman Islands Limited
	In November 2007, shareholders of Qunar Cayman Islands Limited (“Qunar”) approved the 2007 Share Incentive Plan (the “2007 Plan”), which is administered by Qunar’s Board of Directors (“Qunar’s BOD”) or any of its committees. Under the 2007 Plan, Qunar’s BOD may grant options to its employees, directors and consultants to purchase Qunar’s ordinary shares. The aggregate number of shares under the 2007 Plan was increased to 26,060,000 shares on December 29, 2011 with Qunar BOD’s approval. On August 10, 2012, Qunar BOD’s approved that starting from January 1, 2013, the number of shares available for issuance under the 2007 Plan would increase annually by 1.5% of the total outstanding ordinary and redeemable ordinary shares as of January 1 of that respective calendar year. On September 22, 2013, Qunar’s BOD approved an increase in the number of shares available for issuance under the 2007 Plan by 6,066,896 shares. These options granted have a contractual term of ten years and generally vest over a four year period, with 25% of the awards vesting one year after the date of grant and 1/16 of the remaining grants vesting on a quarterly basis thereafter.
	Under the 2007 Plan, Qunar granted 4,765,068, 10,988,106 and 9,993,411 share options to its employees during the years ended December 31, 2012, 2013 and 2014, respectively. Included in the grants, nil, 1,671,867 and 7,929,555 shares options granted during the years ended December 31, 2012, 2013 and 2014, respectively, have performance condition on their exercisability.
	On January 13, 2013, Qunar’s BOD approved a business unit incentive plan (the “BU incentive plan”), which is governed under the aforementioned 2007 Plan. Under the BU incentive plan, Qunar’s BOD may grant options to its employees of specific business units to purchase an aggregate of no more than 10,800,000 Class B ordinary shares of Qunar. On November 25, 2014, Qunar’s BOD approved an extension of the BU incentive plan to cover employees of additional business units. The total number of Class B ordinary shares of Qunar to be issued under the BU incentive plan was increased to 18,000,000. The options will be granted at an exercise price of US$0.01 if the business units meet their respective certain long-term performance conditions. Upon grant, the options have a vesting term of three months. There have been no grants under the BU incentive plan up to December 31, 2014. Qunar also concluded that there was no service inception preceding the grant date as there has been no authorization from Qunar’s BOD based on its accounting policies up to December 31, 2014.
	The following table summarizes Qunar’s option activity for the year ended December 31, 2014:
		Number of			Weighted		Weighted		Aggregate
		shares			average		average		intrinsic
					exercise		remaining		value (US$
					price		contractual		in
					(US$)		life (Years)		thousands)
	Qunar’s share options
	Outstanding, December 31, 2013		25,192,696			1.4		7.39		184,355
	Granted		9,993,411			0.01
	Exercised		(8,907,408	)		0.27
	Forfeited/Cancelled		(1,115,256	)		0.02
	Outstanding, December 31, 2014		25,163,443			1.3		7.89		201,417
Vested and expected to vest at December 31, 2014		21,880,749			1.43		7.75		176,072
Exercisable at December 31, 2014		9,685,685			1.72		6.62		75,118
The aggregate intrinsic value in the table above represents the difference between the fair value of Qunar’s ordinary share as at the balance sheet date and the exercise price. Total intrinsic value of options exercised for the three years ended December 31, 2012, 2013 and 2014 was RMB31.11 million, RMB88.92 million and RMB508.52 million (US$82.02 million), respectively. The total fair value of the options vested during the years ended December 31, 2012, 2013 and 2014 were RMB23.78 million, RMB88.87 million and RMB220.80 million (US$35.61 million), respectively.
As of December 31, 2014, there were RMB448.16 million (US$72.28 million) of unrecognized share-based compensation costs, net of estimated forfeitures, related to equity awards that are expected to be recognized over a weighted-average vesting period of 2.71 years. Total unrecognized compensation costs may be adjusted for future changes in estimated forfeitures.
The fair value of each option award was estimated on the grant date using the Black-Scholes-Merton option-pricing model, with the assistance from an independent third-party appraiser. Qunar is ultimately responsible for the determination of all amounts related to share-based compensation recorded in the financial statements. The risk-free interest rate for periods within the contractual life of the share option is based on the U.S. Treasury yield curve in effect at the time of grant for a term consistent with the expected term of the awards. The expected term of stock options granted is developed giving consideration to the vesting period and contractual term. Qunar did not expect to declare any dividends on its ordinary shares on the respective grant dates. Expected volatility is estimated based on the historical volatility ordinary shares of several comparable companies in the same industry.
The following table presents the assumptions used to estimate the fair values of the share options granted in the years presented:
	2012			2013		2014
Risk-free interest rate		1.70%~2.28%			1.91%~2.71%		1.91%~2.07%
Dividend yield		—			—		—
Expected volatility range		48.03%~49.84%			46.68%~47.66%		45.78%~46.58%
Expected life (in years)		10			10		6.11
The total weighted average grant-date fair value of the equity awards granted during the years ended December 31, 2012, 2013 and 2014 were RMB12.54, RMB16.59 and RMB58.59 (US$9.45) per option, respectively.
The total compensation cost recognized by Qunar was RMB27.21 million, RMB63.71 million and RMB266.37 million (US$42.93 million) for the years ended December 31, 2012, 2013 and 2014, respectively.
Subsidiaries – Others
Other subsidiaries apart from Qunar also have equity incentive plans granting share-based awards. Total share-based compensation expenses recognized and unrecognized were insignificant, both individually and in aggregate, for all years presented.
The following table summarizes the total compensation cost recognized by the Group:
	For the years ended December 31,
	2012			2013		2014		2014
	RMB			RMB		RMB		US$
	(In thousands)
Expensed as cost of revenues		10,105			23,976		34,611		5,578
Expensed as selling, general and administrative		54,512			164,704		426,052		68,667
Expensed as research and development		147,692			326,047		502,077		80,921
Capitalized as part of internal-used software		1,944			229		—		—

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	19.    RELATED PARTY TRANSACTIONS
	The current portion of amounts due from related parties mainly represents amounts in connection with services provided by the Group to its equity method investees, which arose in the ordinary course of business.
	The current portion of amounts due to related parties mainly represents amounts of the reimbursements to Mr. Robin Yanhong Li’s use of an aircraft beneficially owned by his spouse for the Company’s business purposes.
	The balances of non-current portion of amounts due from/to related parties as of December 31, 2013 were settled during the year ended December 31, 2014.

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting	20.    SEGMENT REPORTING
	The Company has only one single operating segment. Substantially all of the Company’s revenue and long-lived assets are derived from and located in the PRC. The Company has only minimal operations in Japan and other countries.
	The following table sets forth revenues by geographic area:
		For the years ended December 31,
		2012		2013		2014		2014
		RMB		RMB		RMB		US$
		(In thousands)
	Revenues:
	PRC		22,198,685		31,875,202		48,793,898		7,864,149
	Non-PRC		107,341		68,722		258,420		41,650
	The following table sets forth long-lived assets by geographic area:
		As of December 31,
		2013		2014		2014
		RMB		RMB		US$
		(In thousands)
	Long-lived assets:
	PRC		5,355,157		9,466,458		1,525,716
	Non-PRC		56,143		84,949		13,691

Fair_Value_Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurement	21.    FAIR VALUE MEASUREMENT
	ASC topic 820 (“ASC 820”), Fair Value Measurements and Disclosures, establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
	Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets
	Level 2 – Include other inputs that are directly or indirectly observable in the marketplace
	Level 3 – Unobservable inputs which are supported by little or no market activity
	ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.
	Assets and Liabilities Measured or Disclosed at Fair Value
	In accordance with ASC 820, the Company measures available-for-sale investments at fair value on a recurring basis. The fair values of the Company’s held-to-maturity investments as disclosed are determined based on the discounted cash flow model using the discount curve of market interest rates. The fair value of the Company’s long-term available-for-sale debt investment is measured using the market approach. The fair values of the Company’s available-for-sale equity investments in the equity securities of publicly listed companies are measured using quoted market prices.
	The Company measures certain financial assets, including equity method investments and cost method investments, at fair value on a nonrecurring basis only if an impairment charge were to be recognized. The Company’s non-financial assets, such as intangible assets, goodwill and fixed assets, would be measured at fair value only if they were determined to be impaired on an other-than-temporary basis.
	The fair value of the long-term notes payable is disclosed using quoted market price.
	Assets and liabilities measured or disclosed at fair value are summarized below:
		Total fair		Fair value measurement or disclosure
		value at		at December 31, 2013 using
		December 31,
		2013		Quoted prices		Significant other		Significant		Total losses
				in active		observable		unobservable
				markets for		inputs		inputs
				identical		(Level 2)		(Level 3)
				assets
				(Level 1)
		RMB		RMB		RMB		RMB		RMB
		(In thousands)
	Fair value disclosure (Notes 2 and 4)
	Cash equivalents
	Time deposits		2,955,924				2,955,924
	Money market fund		689,254		689,254
	Short-term investments Held-to-maturity investments
	Fixed-rate investments		19,370,067				19,370,067
	Long-term notes payable		14,797,937		14,797,937
	Fair value measurement
	Recurring
	Short-term investments Available-for-sale investments
	Fixed-rate debt investments		7,627,958				7,627,958
	Adjustable-rate debt investments		514,433				514,433
	Equity investment		1,253,120		1,253,120
	Non-recurring
	Long-term investments		—						—		(17,521	)
	Fixed assets		—						—		(2,057	)
	Intangible assets		—						—		(4,619	)
	Total assets measured at fair value		9,395,511		1,253,120		8,142,391		—		(24,197	)
	The Company has no assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2013.
	As of December 31, 2013, certain fixed assets (Note 7), intangible assets (Note 8), cost method investments (Note 4) and equity method investments (Note 4) were measured using significant unobservable inputs (Level 3) and written down from their respective carrying value to fair value of nil, with impairment charges incurred and recorded in earnings for the year then ended.
		Total fair value at				Fair value measurement or disclosure
		December 31, 2014				at December 31, 2014 using
						Quoted prices in		Significant other		Significant			Total losses
						active markets		observable		unobservable
						for identical		inputs		inputs
						assets (Level 1)		(Level 2)		(Level 3)
		RMB		US$		RMB		RMB		RMB			RMB			US$
		(In thousands)
	Fair value disclosure (Notes 2 and 4)
	Cash equivalents
	Time deposits		1,746,888		281,547				1,746,888
	Money market fund		755,095		121,699		755,095
	Short-term investments Held-to-maturity investments
	Fixed-rate investments		38,248,723		6,164,575				38,248,723
	Adjustable-rate investments		59,519		9,593				59,519
	Long-term investments Held-to-maturity investments
	Fixed-rate investments		531,318		85,633				531,318
	Long-term notes payable		21,811,666		3,515,403		21,811,666
	Fair value measurement
	Recurring
	Short-term investments Available-for-sale investments
	Fixed-rate debt investments		2,865,096		461,770				2,865,096
Adjustable-rate debt investments		1,568,543		252,803				1,568,543
Equity investments		1,164,714		187,718		1,164,714
Long-term investments Available-for-sale investments
Debt investment		272,680		43,948						272,680
Equity investment		115,921		18,683		115,921
Non-recurring
Long-term investments		—		—						—			(93,424	)		(15,057	)
Intangible assets		—		—						—			(1,625	)		(262	)
Total assets measured at fair value		5,986,954		964,922		1,280,635		4,433,639		272,680			(95,049	)		(15,319	)
As of December 31, 2014, long-term available-for-sale debt investment was measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
As of December 31, 2014, certain intangible assets (Note 8) and equity method investments (Note 4) were measured using significant unobservable inputs (Level 3) and written down from their respective carrying value to fair value of nil, with impairment charges incurred and recorded in earnings for the year then ended.
The following table presents a reconciliation of long-term available-for-sale debt investment at fair value on a recurring basis using significant unobservable inputs (Level 3).
	Long-term available-for-
	sale debt investment
	RMB		US$
	(In thousands)
Balance as of January 1, 2014		—		—
Recognized during the period		272,680		43,948
Realized or unrealized gain (loss)		—		—
Settlement		—		—
Balance as of December 31, 2014		272,680		43,948

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation
	The consolidated financial statements include the financial statements of the Company, its subsidiaries, VIEs and subsidiaries of the VIEs. All inter-company transactions and balances between the Company, its subsidiaries, VIEs and subsidiaries of the VIEs are eliminated upon consolidation. The Company has included the results of operations of acquired businesses from the respective dates of acquisition.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Management evaluates estimates, including those related to the accounts receivable allowances, fair values of options to purchase the Company’s or its subsidiaries’ ordinary shares, fair values of certain debt and equity investments, amortization of certain licensed copyright, impairment of long-lived assets, long-term investments and goodwill, the purchase price allocation and fair value of noncontrolling interests with respect to business combinations, and deferred tax valuation allowance, among others. Management bases the estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from these estimates.
Foreign Currency	Foreign Currency
	The Company’s functional currency is the US$. The Company’s subsidiaries, VIEs and subsidiaries of the VIEs determine their functional currencies based on the criteria of ASC topic 830 (“ASC 830”), Foreign Currency Matters. The Company uses the RMB as its reporting currency. The Company uses the average exchange rate for the year and the exchange rate at the balance sheet date to translate its operating results and financial position, respectively. Any translation gains (losses) are recorded in other comprehensive income (loss). Transactions denominated in foreign currencies are translated into the functional currency at the exchange rates prevailing on the transaction dates. Assets and liabilities denominated in foreign currencies are translated into the functional currency at the exchange rates prevailing at the balance sheet date. Exchange gains and losses are included in earnings as a component of other income.
Segment Reporting	Segment Reporting
	In accordance with ASC topic 280 (“ASC 280”), Segment Reporting, the Company’s chief operating decision makers rely upon consolidated results of operations when making decisions about allocating resources and assessing performance of the Company; hence, the Company has only one single operating segment. The Company does not distinguish between markets or segments for the purpose of internal reporting.
Business Combinations	Business Combinations
	The Company accounts for its business combinations using the purchase method of accounting in accordance with ASC topic 805 (“ASC 805”), Business Combinations. The purchase method of accounting requires that the consideration transferred to be allocated to the assets, including separately identifiable assets and liabilities the Company acquired, based on their estimated fair values. The consideration transferred in an acquisition is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued as well as the contingent considerations and all contractual contingencies as of the acquisition date. The costs directly attributable to the acquisition are expensed as incurred. Identifiable assets, liabilities and contingent liabilities acquired or assumed are measured separately at their fair value as of the acquisition date, irrespective of the extent of any noncontrolling interests. The excess of (i) the total of cost of acquisition, fair value of the noncontrolling interests and acquisition date fair value of any previously held equity interest in the acquiree over (ii) the fair value of the identifiable net assets of the acquiree, is recorded as goodwill. If the cost of acquisition is less than the fair value of the net assets of the subsidiary acquired, the difference is recognized directly in earnings.
	In a business combination achieved in stages, the Company remeasures its previously held equity interest in the acquiree immediately before obtaining control at its acquisition-date fair value and the re-measurement gain or loss, if any, is recognized in earnings.
	The determination and allocation of fair values to the identifiable assets acquired, liabilities assumed and noncontrolling interests is based on various assumptions and valuation methodologies requiring considerable judgment from management. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. The Company determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets, forecasted life cycle and forecasted cash flows over that period.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents
	Cash and cash equivalents are stated at cost, which approximates fair value, and primarily consist of cash and investments in interest bearing demand deposit accounts, time deposits, highly liquid investments and money market funds. All time deposits, money market funds and other highly liquid investments with original maturities of three months or less from the date of purchase are classified as cash equivalents.
	Restricted cash
	Restricted cash mainly consists of the cash reserved in escrow accounts for the remaining payments in relation to compensation for postcombination services, cash collateral for repayment of short-term loans (Note 10), as well as the cash balances deposited by users or customers of the Group that were held for designated purposes.
	The cash balances deposited by users or customers of the Group for certain businesses are considered restricted because they cannot be used for the operations of the Group or any other purposes not designated by the users or customers. The deposited balance is included in the Group’s bank accounts until being used for the designated purposes or withdrawn by the users or customers.
Accounts Receivable	Accounts Receivable
	Accounts receivable are recognized and carried at original invoiced amount less an allowance for any potential uncollectible amounts. An estimate for doubtful debts is made when collection of the full amount is no longer probable. Bad debts are written off as incurred. The Company generally does not require collateral from its customers.
	The Company maintains allowances for doubtful accounts for estimated losses resulting from the failure of customers to make payments on time. The Company reviews the accounts receivable on a periodic basis and makes general and specific allowances when there is doubt as to the collectability of individual balances. In evaluating the collectability of individual receivable balances, the Company considers many factors, including the age of the balance, the customer’s payment history, its current credit-worthiness and current economic trends.
Receivables from Online Payment Agencies	Receivables from Online Payment Agencies
	Receivables from online payment agencies are cash due from the third-party online payment service providers for clearing transactions. The cash was paid or deposited by customers or users through these online payment agencies for services provided by the Company. The Company carefully considers and monitors the credit worthiness of the third-party payment service providers used. An allowance for doubtful accounts is recorded in the period in which a loss is determined to be probable. Receivable balances are written off after all collection efforts have been exhausted. As of December 31, 2013 and 2014, no allowance for doubtful accounts was provided for the receivables from online payment agencies.
Investments	Investments
	Short-term investments
	All highly liquid investments with original maturities of greater than three months, but less than 12 months, are classified as short-term investments. Investments that are expected to be realized in cash during the next 12 months are also included in short-term investments. The Company accounts for short-term investments in accordance with ASC topic 320 (“ASC 320”), Investments – Debt and Equity Securities. The Company classifies the short-term investments in debt and equity securities as “held-to-maturity”, “trading” or “available-for-sale”, whose classification determines the respective accounting methods stipulated by ASC 320. Dividend and interest income, including amortization of the premium and discount arising at acquisition, for all categories of investments in securities are included in earnings. Any realized gains or losses on the sale of the short-term investments are determined on a specific identification method, and such gains and losses are reflected in earnings during the period in which gains or losses are realized.
	The securities that the Company has positive intent and ability to hold to maturity are classified as held-to-maturity securities and stated at amortized cost. For individual securities classified as held-to-maturity securities, the Company evaluates whether a decline in fair value below the amortized cost basis is other-than-temporary in accordance with the Company’s policy and ASC 320. When the Company intends to sell an impaired debt security or it is more-likely-than-not that it will be required to sell prior to recovery of its amortized cost basis, an other-than-temporary impairment is deemed to have occurred. In these instances, the other-than-temporary impairment loss is recognized in earnings equal to the entire excess of the debt security’s amortized cost basis over its fair value at the balance sheet date of the reporting period for which the assessment is made. When the Company does not intend to sell an impaired debt security and it is more-likely-than-not that it will not be required to sell prior to recovery of its amortized cost basis, the Company must determine whether or not it will recover its amortized cost basis. If the Company concludes that it will not, an other-than-temporary impairment exists and that portion of the credit loss is recognized in earnings, while the portion of loss related to all other factors is recognized in other comprehensive income.
	The securities that are bought and held principally for the purpose of selling them in the near term are classified as trading securities. Unrealized holding gains and losses for trading securities are included in earnings.
	Investments not classified as trading or as held-to-maturity are classified as available-for-sale securities. Available-for-sale investment is reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive income (loss). Realized gains or losses are included in earnings during the period in which the gain or loss is realized. An impairment loss on the available-for-sale securities would be recognized in the consolidated statements of comprehensive income when the decline in value is determined to be other-than-temporary.
	Long-term investments
	The Company’s long-term investments consist of cost method investments, equity method investments, held-to-maturity investments with original and remaining maturities of greater than 12 months, and available-for-sale investments.
	In accordance with ASC subtopic 325-20 (“ASC 325-20”), Investments-Other: Cost Method Investments, for investments in an investee over which the Company does not have significant influence and which do not have readily determinable fair value, the Company carries the investment at cost and only adjusts for other-than-temporary declines in fair value and distributions of earnings that exceed the Company’s share of earnings since its investment. Management regularly evaluates the impairment of the cost method investments based on performance and financial position of the investee as well as other evidence of market value. Such evaluation includes, but is not limited to, reviewing the investee’s cash position, recent financing, projected and historical financial performance, cash flow forecasts and financing needs. An impairment loss is recognized in earnings equal to the excess of the investment’s cost over its fair value at the balance sheet date of the reporting period for which the assessment is made. The fair value would then become the new cost basis of investment.
	Investments in entities in which the Company can exercise significant influence but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC topic 323 (“ASC 323”), Investments-Equity Method and Joint Ventures. Under the equity method, the Company initially records its investment at cost and the difference between the cost of the equity investee and the fair value of the underlying equity in the net assets of the equity investee is recognized as equity method goodwill, which is included in the equity method investment on the consolidated balance sheets. The Company subsequently adjusts the carrying amount of the investment to recognize the Company’s proportionate share of each equity investee’s net income or loss into earnings after the date of investment. The Company will discontinue applying the equity method if an investment (and additional financial supports to the investee, if any) has been reduced to zero. Under the conditions that the Company is not required to advance additional funds to an investee and the equity-method investment in ordinary shares is reduced to zero, if further investments are made that have a higher liquidation preference than ordinary shares, the Company would recognize the loss based on its percentage of the investment with the same liquidation preference, and the loss would be applied to those investments of a lower liquidation preference first before being further applied to the investments of a higher liquidation preference. The Company evaluates the equity method investments for impairment under ASC 323. An impairment loss on the equity method investments is recognized in earnings when the decline in value is determined to be other-than-temporary.
	Long-term held-to-maturity investments and available-for-sale investments are measured in the same manner as short-term held-to-maturity investments.
Fair Value Measurements of Financial Instruments	Fair Value Measurements of Financial Instruments
	Financial instruments are in the form of cash and cash equivalents, restricted cash, short-term investments, accounts receivable, amounts due from and due to related parties, other receivables, long-term investments, accounts payable and accrued liabilities, customer advances and deposits, derivative instruments, capital lease obligation, notes payable and long-term loans. The carrying amounts of these financial instruments, except for long-term cost method investments, long-term equity method investments, long-term available-for-sale investments, long-term held-to-maturity investments, derivative instruments, notes payable and long-term loans, approximate their fair values because of their generally short maturities. Available-for-sale investments and derivative instruments were adjusted to fair value at each reporting date. The carrying amounts of long-term held-to-maturity investments and long-term loans approximate their fair values due to the fact that the related interest rates approximate the rates currently offered by financial institutions for similar debt instruments of comparable maturities. Based on the quoted market price as of December 31, 2014, the fair value of the notes payable was RMB21.81 billion (US$3.52 billion) (Note 21).
Research, Development and Computer Software	Research, Development and Computer Software
	Capitalization of software developed for internal use
	The Company has capitalized certain internal use software development costs in accordance with ASC subtopic 350-40 (“ASC 350-40”), Intangibles-Goodwill and Other: Internal-Use Software, amounting to RMB38.13 million, RMB2.68 million and nil for the years ended December 31, 2012, 2013 and 2014, respectively. The Company capitalizes certain costs relating to software acquired, developed, or modified solely to meet the Company’s internal requirements and for which there are no substantive plans to market the software. These costs mainly include payroll and payroll-related costs for employees who are directly associated with and who devote time to the internal-use software projects during the application development stage. Capitalized internal-use software costs are included in “intangible assets, net”. The amortization expense for capitalized software costs amounted to RMB19.72 million, RMB31.65 million and RMB28.24 million (US$4.55 million) for the years ended December 31, 2012, 2013 and 2014, respectively. The unamortized amount of capitalized internal use software development costs was RMB41.48 million and RMB13.24 million (US$2.13 million) as of December 31, 2013 and 2014, respectively.
	Research and development expenses
	Research and development expenses consist primarily of personnel-related costs. The Company has expensed substantially all development costs incurred in the research and development of new products and new functionality added to the existing products except for certain internal use software development costs.
Fixed Assets	Fixed Assets
	Fixed assets are stated at cost less accumulated depreciation. Depreciation is recorded on a straight-line basis over the shorter of the estimated useful lives of the assets or the term of the related lease, as follows:
	Office building	– 45 years
	Office building related facility, machinery and equipment	– 15 years
	Computer equipment	– 3 or 5 years
	Office equipment	– 3 or 5 years
	Vehicles	– 5 years
	Leasehold improvements	– over the shorter of lease terms or estimated useful lives of the assets
	Fixed assets have no estimated residual value except for the office building and its related facility, machinery and equipment, which have an estimated residual value of 4% of the cost.
	Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterments that extend the useful life of fixed assets are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in earnings.
	All direct and indirect costs that are related to the construction of fixed assets and incurred before the assets are ready for their intended use are capitalized as construction in progress. Construction in progress is transferred to specific fixed assets items and depreciation of these assets commences when they are ready for their intended use.
	Interest costs are capitalized if they are incurred during the acquisition, construction or production of a qualifying asset and such costs could have been avoided if expenditures for the assets have not been made. Capitalization of interest costs commences when the activities to prepare the asset are in progress and expenditures and borrowing costs are being incurred. Interest costs are capitalized until the assets are ready for their intended use. Interest costs capitalized for the years ended December 31, 2012, 2013 and 2014 were insignificant.
Licensed copyrights of video content	Licensed copyrights of video content
	The current and non-current portions of licensed copyrights of video content are recorded in “Other current assets, net” or “Intangible assets, net”, respectively, at the lower of amortized cost or net realizable value. In accordance with ASC topic 920 (“ASC 920”), Entertainment-Broadcasters, costs incurred in purchased copyrights of video content are capitalized and amortized over the shorter of the license period or projected useful life of the video content. Any licensed copyrights that do not meet the criteria to be recorded are included in the commitments disclosure. The Company amortizes the licensed copyrights in “Cost of revenues” on an accelerated or on a straight line basis, as appropriate. If expectations of the usefulness of a video content are revised downward, the unamortized cost is written down to the estimated net realizable value. A write-down from unamortized cost to a lower estimated net realizable value establishes a new cost basis.
Goodwill and Intangible Assets	Goodwill and Intangible Assets
	Goodwill
	The Company assesses goodwill for impairment in accordance with ASC subtopic 350-20 (“ASC 350-20”), Intangibles – Goodwill and Other: Goodwill, which requires that goodwill to be tested for impairment at the reporting unit level at least annually and more frequently upon the occurrence of certain events, as defined by ASC 350-20.
	Subsequent to the acquisitions in 2011 and thereafter, there were segment managers who regularly review operating results of certain acquired entities and the rest of the Group, which constitute three separate reporting units as of December 31, 2013 and 2014.
	The Company has the option to first assess qualitative factors to determine whether it is necessary to perform the two-step test in accordance with Accounting Standards Update (“ASU”) No. 2011-08 (“ASU 2011-08”), Testing Goodwill for Impairment. If the Company believes, as a result of the qualitative assessment, that it is more-likely-than-not that the fair value of the reporting unit is less than its carrying amount, the two-step quantitative impairment test described above is required. Otherwise, no further testing is required. In the qualitative assessment, the Company considers primary factors such as industry and market considerations, overall financial performance of the reporting unit, and other specific information related to the operations. In performing the two-step quantitative impairment test, the first step compares the carrying amount of the reporting unit to the fair value of the reporting unit based on either quoted market prices of the ordinary shares or estimated fair value using a combination of the income approach and the market approach. If the fair value of the reporting unit exceeds the carrying value of the reporting unit, goodwill is not impaired and the Company is not required to perform further testing. If the carrying value of the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. The fair value of the reporting unit is allocated to its assets and liabilities in a manner similar to a purchase price allocation in order to determine the implied fair value of the reporting unit goodwill. If the carrying amount of the goodwill is greater than its implied fair value, the excess is recognized as an impairment loss.
	In 2014, the Company performed a qualitative assessment for the reporting unit other than the certain acquired entities. Based on the requirements of ASU 2011-08, the Company evaluated all relevant factors, weighed all factors in their entirety and concluded that it was not more-likely-than-not the fair value was less than the carrying amount of the this reporting unit, and further impairment testing on goodwill was unnecessary as of December 31, 2014. The Company elected to assess goodwill for impairment using the two-step process at two reporting units, representing the aforementioned acquired entities. The fair value of the two reporting units exceeded their respective carrying amount, and therefore goodwill related to these two reporting units were not impaired and the Company was not required to perform further testing.
	Intangible assets
	Intangible assets with finite lives are carried at cost less accumulated amortization. Land use rights are amortized using a straight-line method over the shorter of their estimated economic lives or the terms of related land use right contracts. All other intangible assets with finite lives are amortized using the straight-line method over the estimated economic lives.
	Intangible assets have weighted average economic lives from the date of purchase as follows:
	Land use rights	– 50 years
	Customer relationships	– 5.5 years
	Software	– 4.2 years
	Trademarks	– 9.8 years
	User list	– 3.4 years
	Licensed copyrights of video contents	– 3.4 years
	Others	– 5.9 years
	Intangible assets with an indefinite useful life are not amortized and are tested for impairment annually or more frequently if events or changes in circumstances indicate that they might be impaired in accordance with ASC subtopic 350-30 (“ASC 350-30”),Intangibles-Goodwill and Other: General Intangibles Other than Goodwill.
Impairment of Long-Lived Assets Other Than Goodwill	Impairment of Long-Lived Assets Other Than Goodwill
	The Company evaluates long-lived assets, such as fixed assets and purchased or internally developed intangible assets with finite lives, for impairment whenever events or changes in circumstances indicate the carrying value of an asset may not be recoverable in accordance with ASC topic 360 (“ASC 360”), Property, Plant and Equipment. When such events occur, the Company assesses the recoverability of the assets group based on the undiscounted future cash flow the assets group is expected to generate and recognizes an impairment loss when estimated undiscounted future cash flow expected to result from the use of the assets group plus net proceeds expected from disposition of the assets group, if any, is less than the carrying value of the assets group. If the Company identifies an impairment, the Company reduces the carrying amount of the assets group to its estimated fair value based on a discounted cash flow approach or, when available and appropriate, to comparable market values. The Company uses estimates and judgments in its impairment tests and if different estimates or judgments had been utilized, the timing or the amount of any impairment charges could be different. Asset groups to be disposed of would be reported at the lower of the carrying amount or fair value less costs to sell, and no longer depreciated. The assets and liabilities of a disposal group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheets.
Revenue Recognition	Revenue Recognition
	The Company recognizes revenue based on the following principles:
	Performance-based online marketing services
	Cost-per-click
	The Company’s auction-based pay-for-performance (“P4P”) platform enables a customer to place its website link and related description on the Company’s search result list on the website which could be accessed through personal computer or mobile devices. Customers make bids on keywords based on how much they are willing to pay for each click to their listings in the search results listed on the Company’s website and the relevance between the keywords and the customer’s businesses. Internet users’ search of the keyword will trigger the display of the listings. The ranking of the customer’s listing depends on both the bidding price and the listing’s relevance to the keyword searched. Customer pays the Company only when a user clicks on one of its website links. Other than the auction-based P4P platform, the Company has certain vertical platforms from which it generates revenue through pre-determined prices per click. Revenue is recognized when a user clicks on one of the customer-sponsored website links, as there is persuasive evidence of an arrangement, the fee is fixed or determinable and collection is reasonably assured, as prescribed by ASC topic 605 (“ASC 605”), Revenue Recognition.
	For certain customers engaged through direct sales, the Company may provide certain value-added consultative support services to help its customers to better utilize its online marketing system. Fees for such services are recognized as revenue on a pro-rata basis over the contracted service period.
	Other performance-based online marketing services
	To the extent the Company provides online marketing services based on performance criteria other than cost-per-lick, such as the number of successful reservation of hotels or issuance of air tickets, the number of downloads (and user registration) of mobile applications, the number of incremental end users and the total incremental revenue generated, revenue is recognized when the specified performance criteria are met together with satisfaction of other applicable revenue recognition criteria as prescribed by ASC 605.
	Display-based online advertising services
	For display-based online advertising services such as text links, banners, icons or other forms of graphical advertisements in the websites or mobile applications, the Company recognizes revenue in accordance with ASC 605, on a pro-rata basis over the contractual term for cost per time advertising arrangements commencing on the date the customer’s advertisement is displayed on a specified webpage or mobile applications, or on the number of times that the advertisement has been displayed for cost per thousand impressions advertising arrangements. For certain display-based contractual agreements, the Company may also provide certain performance guarantees, in which cases revenue is recognized at the later of the completion of the time commitment or performance guarantee.
	Online game services and other revenue sharing services
	The Company operates online game platforms on which registered users can access games provided by third-party game developers. The Company also operates mobile platforms on which users can access smartphone related products such as themes, wallpapers and e-books developed and owned by third-party content providers. The rights and obligations of each party to the arrangement indicate that the Company is acting as an agent whereas the game developer or the content provider is the principal as a result of being the primary obligor in the arrangement in accordance with ASC subtopic 605-45 (“ASC 605-45”), Revenue Recognition: Principal Agent Consideration. The Company recognizes the shared revenue from these online promotional services, on a net basis, based on the ratios pre-determined with the online game developers or content providers when all the revenue recognition criteria set forth in ASC 605 are met, which is generally when the user purchases virtual currencies issued by the game developers or purchases contents developed by the content providers.
	Group buying services
	The Company generates revenue from group buying services as a marketing agent by offering goods and services provided by third-party merchant partners at a discount through the website or mobile application that connects merchants to consumers. The Company presents revenue on a net basis, representing the amount billed to registered users less the amount paid to merchants, in accordance with ASC 605-45. The Company acts as an agent rather than as the principal in the delivery of the products or services as it does not assume the risks and rewards of ownership of products nor is it responsible for the actual fulfillment of services. Both of these are the responsibilities of the merchants. The Company recognizes revenue when all of the criteria prescribed in ASC 605 are met, which is generally when the merchants provide the services or when the products are delivered to the customers. Since the Company’s paying users have the ability to request for full refund before redemption for the products or services offered by the merchants, the underlying sale from which the Company earns the related commission revenue as an agent is not culminated until its paying users actually redeem.
	Online marketing services involving Baidu Union
	Baidu Union is the program through which the Company expands distribution of its customers’ sponsored links or advertisements by leveraging traffic of the Baidu Union members’ internet properties. The Company makes payments to Baidu Union members for acquisition of traffic. The Company recognizes gross revenue for the amount of fees it receives from its customers. Payments made to Baidu Union members are included in cost of revenues as traffic acquisition costs.
	Barter transactions
	The Company engages in barter transactions from time to time and in such situations follows the guidance set forth in ASC topic 845 (“ASC 845”), Nonmonetary Transactions. While nonmonetary transactions are generally recorded at fair value, if such value is not determinable within reasonable limits, or the transaction lacks commercial substance, or the transaction is an exchange of a product or property held for sale in the ordinary course of business for a product or property to be sold in the same line of business to facilitate sales to customers other than the parties to the exchange, the transaction is recognized based on the carrying value of the product or services provided. The Company also engages in certain advertising barter transactions and follows the guidance set forth in ASC subtopic 605-20 (“ASC 605-20”), Revenue Recognition: Services. The advertising barter transactions generally are recorded at fair value. If the fair value of the advertising surrendered in the barter transaction is not determinable within required limits, the barter transaction is recorded based on the carrying amount of the advertising surrendered, which likely to be zero. The amount of revenues recognized for barter transactions was insignificant for each of the years presented.
	Other revenue recognition related policies
	In accordance with ASC subtopic 605-25 (“ASC 605-25”), Revenue Recognition: Multiple-Deliverable Revenue Arrangements, for arrangements that include multiple deliverables, primarily for advertisements to be displayed in different spots, placed under different forms and occur at different time, the Company allocates the total consideration of the arrangements based on their relative selling price, with the selling price of each deliverable determined using vendor-specific objective evidence (“VSOE”) of selling price, third-party evidence (“TPE”) of selling price, or management’s best estimate of the selling price (“BESP”). The Company considers all reasonably available information in determining the BESP, including both market and entity-specific factors.
	The Company delivers some of its online marketing services to end customers through engaging third-party distributors. In this context, the Company may provide cash incentives to distributors. The cash incentives are accounted for as reduction of revenue in accordance with ASC subtopic 605-50 (“ASC 605-50”), Revenue Recognition: Customer Payments and Incentives.
	The Company provides sales incentives to customers to entitle customers to receive reductions in the price of the online marketing services by meeting certain cumulative consumption requirements. The Company accounts for these award credits granted to members in conjunction with a current sale of products or services as a multiple-element arrangement by analogy to ASC 605-25. The consideration allocated to the award credits, as deferred revenue, is based on an assumption that the customer will purchase the minimum amount of future service necessary to obtain the maximum award credits available. The deferred revenue is recognized as revenue proportionately as the future services are delivered to the customer or when the award credits expire.
	Cash received in advance from customers is recorded as customer advances and deposits. The unused cash balances remaining in the customers’ accounts are included as liabilities of the Company. Deferred revenue is recorded when services are provided before the other revenue recognition criteria set forth in ASC 605 are fulfilled.
Cost of Revenues	Cost of Revenues
	Cost of revenues consists primarily of sales taxes (including business tax and output value-added tax) and surcharges, traffic acquisition costs, bandwidth costs, depreciation, content costs, payroll and related costs of operations.
	The Company incurs sales taxes and surcharges in connection with the provision of online marketing services, technical and consultative service fees charged by its subsidiaries to VIEs and other taxable services in the PRC. In accordance with ASC 605-45, the Company includes the sales tax and surcharges incurred on its online marketing revenues in cost of revenues. The sales tax and surcharges in cost of revenues for the years ended December 31, 2012, 2013 and 2014 were RMB1.57 billion, RMB2.33 billion and RMB3.60 billion (US$579.85 million), respectively. Traffic acquisition costs represent the amounts paid or payable to Baidu Union members who direct search queries to the Company’s websites or distribute the Company’s customers’ paid links through their properties. These payments are primarily based on revenue sharing arrangements under which the Company pays its Baidu Union members and other business partners a percentage of the fees it earns from its online marketing customers.
Advertising Expenses	Advertising Expenses
	Advertising expenses, primarily advertisements through various forms of media, are included in “Selling, general and administrative expense” in the consolidated statements of comprehensive income and are expensed when incurred. Advertising expenses for the years ended December 31, 2012, 2013 and 2014 were RMB326.83 million, RMB191.61 million and RMB385.06 million (US$62.06 million), respectively.
Government Subsidies	Government Subsidies
	Government subsidies primarily consist of financial subsidies received from provincial and local governments for operating a business in their jurisdictions and compliance with specific policies promoted by the local governments. There are no defined rules and regulations to govern the criteria necessary for companies to receive such benefits, and the amount of financial subsidy is determined at the discretion of the relevant government authorities. For the government subsidies with non-operating nature and with no further conditions to be met, the amounts are recorded as non-operating income in “Other income, net” when received; whereas for the government subsidies with certain operating conditions, the amounts are recorded as liabilities when received and will be recorded as operating income when the conditions are met.
Leases	Leases
	Leases have been classified as either capital or operating leases. Leases that transfer substantially all the benefits and risks incidental to the ownership of assets are accounted for as capital leases as if there was an acquisition of an asset and incurrence of an obligation at the inception of the lease. All other leases are accounted for as operating leases wherein rental payments are expensed as incurred.
Income Taxes	Income Taxes
	The Company recognizes income taxes under the liability method. Deferred income taxes are recognized for differences between the financial reporting and tax bases of assets and liabilities at enacted tax rates in effect for the years in which the differences are expected to reverse. The Company records a valuation allowance against the amount of deferred tax assets that it determines is not more-likely-than-not to be realized. The effect on deferred taxes of a change in tax rates is recognized in earnings in the period that includes the enactment date.
	The Company applies the provisions of ASC topic 740 (“ASC 740”), Income Taxes, in accounting for uncertainty in income taxes. ASC 740 clarified the accounting for uncertainty in income taxes by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The Company has elected to classify interest and penalties related to an uncertain tax position (if and when required) as part of income tax expense in the consolidated statements of comprehensive income. As of and for the years ended December 31, 2012, 2013 and 2014, the amounts of unrecognized tax benefits as well as interest and penalties associated with uncertainty in income taxes were insignificant.
Share-based Compensation	Share-based Compensation
	The Company accounts for share-based compensation in accordance with ASC topic 718 (“ASC 718”), Compensation-Stock Compensation. The Company has elected to recognize share-based compensation using the straight-line method for all share-based awards issued with no performance conditions. For awards with performance conditions, compensation cost is recognized on an accelerated basis if it is probable that the performance condition will be achieved.
	Forfeitures have been estimated based on historical experience and are periodically reviewed. Cancellation of an award accompanied by the concurrent grant of a replacement award is accounted for as a modification of the terms of the cancelled award (“modification awards”). The compensation costs associated with the modification awards are recognized if either the original vesting condition or the new vesting condition has been achieved. Such compensation costs will not be less than the grant-date fair value of the original award. The incremental compensation cost is measured as the excess of the fair value of the replacement award over the fair value of the cancelled award at the cancellation date. Therefore, in relation to the modification awards, the Company recognizes share-based compensation over the vesting periods of the new options, which comprises, (i) the amortization of the incremental portion of share-based compensation over the remaining vesting term and (ii) any unrecognized compensation cost of original award, using either the original term or the new term, whichever results in higher expenses for each reporting period.
	The Company accounts for share awards issued to non-employees in accordance with the provisions of ASC subtopic 505-50 (“ASC 505-50”), Equity: Equity-based payments to Non-Employees. The Company uses the Black-Scholes-Merton option pricing model method to measure the value of options granted to non-employees at each vesting date to determine the appropriate charge to share-based compensation. ASC 718 requires share-based compensation to be presented in the same manner as cash compensation rather than as a separate line item.
Earnings Per Share ("EPS")	Earnings Per Share (“EPS”)
	The Company computes earnings per Class A and Class B ordinary shares in accordance with ASC topic 260 (“ASC 260”), Earnings Per Share, using the two-class method. Under the provisions of ASC 260, basic net income per share is computed using the weighted average number of ordinary shares outstanding during the period except that it does not include unvested ordinary shares subject to repurchase or cancellation. The Company accounts for the accretion of the redeemable noncontrolling interests in the calculation of income available to ordinary shareholders of the Company used in the earnings per share calculation.
	Diluted net income per share is computed using the weighted average number of ordinary shares and, if dilutive, potential ordinary shares outstanding during the period. Potentially dilutive securities have been excluded from the computation of diluted net income per share if their inclusion is anti-dilutive. Potential ordinary shares consist of the incremental ordinary shares issuable upon the exercise of stock options, restricted shares subject to forfeiture, and contracts that may be settled in the Company’s stock or cash. The dilutive effect of outstanding stock options and restricted shares is reflected in diluted earnings per share by application of the treasury stock method. The computation of the diluted net income per share of Class A ordinary shares assumes the conversion of Class B ordinary shares, while the diluted net income per share of Class B ordinary shares does not assume the conversion of such shares.
	The liquidation and dividend rights of the holders of the Company’s Class A and Class B ordinary shares are identical, except with respect to voting rights. As a result, and in accordance with ASC 260, the undistributed earnings for each year are allocated based on the contractual participation rights of the Class A and Class B ordinary shares as if the earnings for the year had been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the conversion of Class B ordinary shares is assumed in the computation of the diluted net income per share of Class A ordinary shares, the undistributed earnings are equal to net income for that computation.
	For the purposes of calculating the Company’s basic and diluted earnings per Class A and Class B ordinary shares, the ordinary shares relating to the options that were exercised are assumed to have been outstanding from the date of exercise of such options.
Contingencies	Contingencies
	The Company records accruals for certain of its outstanding legal proceedings or claims when it is probable that a liability will be incurred and the amount of loss can be reasonably estimated. The Company evaluates, on a quarterly basis, developments in legal proceedings or claims that could affect the amount of any accrual, as well as any developments that would make a loss contingency both probable and reasonably estimable. The Company discloses the amount of the accrual if it is material.
	When a loss contingency is not both probable and estimable, the Company does not record an accrued liability but discloses the nature and the amount of the claim, if material. However, if the loss (or an additional loss in excess of the accrual) is at least reasonably possible, then the Company discloses an estimate of the loss or range of loss, if such estimate can be made and material, or states that such estimate is immaterial if it can be estimated but immaterial, or discloses that an estimate cannot be made. The assessments of whether a loss is probable or reasonably possible, and whether the loss or a range of loss is estimable, often involve complex judgments about future events. Management is often unable to estimate the loss or a range of loss, particularly where (i) the damages sought are indeterminate, (ii) the proceedings are in the early stages, or (iii) there is a lack of clear or consistent interpretation of laws specific to the industry-specific complaints among different jurisdictions. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including eventual loss, fine, penalty or business impact, if any.
Concentration of Risks	Concentration of Risks
	Concentration of credit risk
	Financial instruments that potentially subject the Company to significant concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, short-term investments, accounts receivable, amounts due from related parties and long-term held-to-maturity investments. As of December 31, 2014, the Company has RMB58.63 billion (US$9.45 billion) in cash and cash equivalents, restricted cash, short-term investments and long-term held-to-maturity investments, 86.37% and 13.63% of which are held by financial institutions in the PRC and international financial institutions outside of the PRC, respectively. The Company’s total cash and cash equivalents, restricted cash, short-term investments and long-term held-to-maturity investments held at China Merchants Bank and Bank of China exceeded 10%, representing 31.26% and 17.54% of the Company’s total cash and cash equivalents, restricted cash, short-term investments and long-term held-to-maturity investments as of December 31, 2014, respectively.
	PRC state-owned banks, such as Bank of China, are subject to a series of risk control regulatory standards, and PRC bank regulatory authorities are empowered to take over the operation and management when any of those faces a material credit crisis. The Company does not foresee substantial credit risk with respect to cash and cash equivalents, restricted cash and short-term investments held at the PRC state-owned banks. Meanwhile, China does not have an official deposit insurance program, nor does it have an agency similar to what was the Federal Deposit Insurance Corporation (FDIC) in the U.S. In the event of bankruptcy of one of the financial institutions in which the Company has deposits or investments, it may be unlikely to claim its deposits or investments back in full. The Company selected reputable international financial institutions with high rating rates to place its foreign currencies. The Company regularly monitors the rating of the international financial institutions to avoid any potential defaults. There has been no recent history of default in relation to these financial institutions.
	Accounts receivable are typically unsecured and derived from revenue earned from customers and agents in China, which are exposed to credit risk. The risk is mitigated by credit evaluations the Company performs on its customers and its ongoing monitoring process of outstanding balances. The Company maintains reserves for estimated credit losses and these losses have generally been within its expectations.
	Amounts due from related parties are typically unsecured, interest-free and repayable on demand. In evaluating the collectability of the amounts due from related parties balance, the Company considers many factors, including the related parties’ repayment history and their credit-worthiness. An allowance for doubtful accounts is made when collection of the full amount is no longer probable.
	Business and economic risks
	The Company participates in a dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on the Company’s future financial position, results of operations or cash flows: changes in the overall demand for services and products; changes in business offerings; competitive pressures due to new entrants; advances and new trends in new technologies and industry standards; changes in bandwidth suppliers; changes in certain strategic relationships or customer relationships; regulatory considerations; copyright regulations; and risks associated with the Company’s ability to attract and retain employees necessary to support its growth.
	No customer or any Baidu Union member generated greater than 10% of total revenues in any of the years presented.
	The Company’s operations could be adversely affected by significant political, economic and social uncertainties in the PRC.
	Currency convertibility risk
	Substantially all of the Company’s businesses are transacted in RMB, which is not freely convertible into foreign currencies. All foreign exchange transactions take place either through the Bank of China or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the People’s Bank of China. Approval of foreign currency payments by the People’s Bank of China or other regulatory institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts.
	Foreign currency exchange rate risk
	The functional currency and the reporting currency of the Company are the US$ and RMB, respectively. The Company’s exposure to foreign currency exchange rate risk primarily relates to cash and cash equivalents, short-term investments and notes payable denominated in the US$. On June 19, 2010, the People’s Bank of China announced the end of the RMB’s de facto peg to the US$, a policy which was instituted in late 2008 in the face of the global financial crisis, to further reform the RMB exchange rate regime and to enhance the RMB’s exchange rate flexibility. On March 15, 2014, the People’s Bank of China announced the widening of the daily trading band for RMB against US$. The appreciation of the US$ against RMB was approximately 2.49% in 2014. Most of revenues and costs of the Company are denominated in RMB, while a portion of cash and cash equivalents and short-term financial assets are denominated in U.S. dollars. Any significant revaluation of RMB may materially and adversely affect the Company’s cash flows, revenues, earnings and financial position, and the value of, and any dividends payable on, the ADS in US$.
Derivative Instruments	Derivative Instruments
	ASC topic 815 (“ASC 815”), Derivatives and Hedging, requires all contracts which meet the definition of a derivative to be recognized on the balance sheet as either assets or liabilities and recorded at fair value. Changes in the fair value of derivative financial instruments are either recognized periodically in earnings or in other comprehensive income depending on the use of the derivative and whether it qualifies for hedge accounting. Changes in fair values of derivatives not qualified as hedges are reported in earnings. The estimated fair values of derivative instruments are determined at discrete points in time based on the relevant market information. These estimates are calculated with reference to the market rates using industry standard valuation techniques. The fair value of the derivative instruments held by the Company was insignificant for all years presented.
Recent Accounting Pronouncement	Recent Accounting Pronouncement
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers. ASU 2014-09 supersedes the revenue recognition requirements in ASC 605, and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-09 on the consolidated financial statements.
Guarantees	Guarantees
	The Company accounts for guarantees in accordance with ASC topic 460 (“ASC 460”), Guarantees. Accordingly, the Company evaluates its guarantees if any to determine whether (a) the guarantee is specifically excluded from the scope of ASC 460, (b) the guarantee is subject to ASC 460 disclosure requirements only, but not subject to the initial recognition and measurement provisions, or (c) the guarantee is required to be recorded in the financial statements at fair value.

Organization_Consolidation_and1

Organization, Consolidation and Presentation of Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Assets, Liabilities and Results of Operations of VIEs and Their Subsidiaries Included in Company's Consolidated Balance Sheets and Statements of Comprehensive Income	The following tables set forth the assets, liabilities and results of operations of the VIEs and their subsidiaries included in the Company’s consolidated balance sheets and statements of comprehensive income:
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Assets
	Current
	Cash and cash equivalents		1,510,320			2,250,298			362,682
	Accounts receivable, net		1,373,443			2,744,793			442,380
	Others		1,607,462			3,665,314			590,741
			4,491,225			8,660,405			1,395,803
	Non-current
	Fixed assets, net		1,350,852			1,796,162			289,489
	Others		1,301,383			2,157,922			347,794
			2,652,235			3,954,084			637,283
	Total		7,143,460			12,614,489			2,033,086
	Third-party liabilities
	Current
	Accounts payable and accrued liabilities		2,944,821			6,073,083			978,803
	Customer advances and deposits		801,626			802,362			129,317
	Others		284,729			2,937,921			473,508
			4,031,176			9,813,366			1,581,628
	Non-current		975,793			781,835			126,009
	Total		5,006,969			10,595,201			1,707,637
	Inter-company liabilities
	Inter-company payable to subsidiaries for technology consulting and service fees		1,578,759			1,479,423			238,440
	Others		510,821			889,530			143,366
	Total		2,089,580			2,368,953			381,806
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Total revenues		6,429,099			9,040,058			13,166,712			2,122,089
	Net income (loss)		143,626			(248,664	)		(352,125	)		(56,752	)
	Net cash provided by operating activities		1,399,892			1,354,802			1,392,039			224,356
	Net cash used in investing activities		(1,033,164	)		(1,303,612	)		(2,430,505	)		(391,726	)
	Net cash (used in) provided by financing activities		(88,971	)		595,132			1,778,444			286,633

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Estimated Useful lives of Fixed Assets	Fixed assets are stated at cost less accumulated depreciation. Depreciation is recorded on a straight-line basis over the shorter of the estimated useful lives of the assets or the term of the related lease, as follows:
	Office building	– 45 years
	Office building related facility, machinery and equipment	– 15 years
	Computer equipment	– 3 or 5 years
	Office equipment	– 3 or 5 years
	Vehicles	– 5 years
	Leasehold improvements	– over the shorter of lease terms or estimated useful lives of the assets
Intangible Assets, Weighted Average Useful Lives from Date of Purchase	Intangible assets have weighted average economic lives from the date of purchase as follows:
	Land use rights	– 50 years
	Customer relationships	– 5.5 years
	Software	– 4.2 years
	Trademarks	– 9.8 years
	User list	– 3.4 years
	Licensed copyrights of video contents	– 3.4 years
	Others	– 5.9 years

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisitions 2014
Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest	The following table summarizes the estimated aggregate fair values of the assets acquired, liabilities assumed and the noncontrolling interests as of the respective dates of acquisition:
		RMB			US$
		(In thousands)
	Purchase consideration		398,410			64,212
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		(95,961	)		(15,466	)
	Intangible assets, net		249,452			40,204
	Deferred tax liabilities, noncurrent		(67,945	)		(10,951	)
	Pre-existing equity interests		(91,677	)		(14,776	)
	Noncontrolling interests		(150,000	)		(24,175	)
	Goodwill		554,541			89,376
Acquisition of 91 Wireless 2013
Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of October 1, 2013, the date of acquisition:
		RMB
		(In thousands)
	Purchase consideration		11,196,235
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		483,341
	Intangible assets, net		1,146,300
	Deferred tax liabilities, noncurrent		(278,346	)
	Goodwill		9,844,940
Other Business Acquisition in 2013
Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest	The following table summarizes the estimated aggregate fair values of the assets acquired, liabilities assumed and the noncontrolling interests as of the respective dates of acquisition:
		RMB
		(In thousands)
	Purchase consideration		3,865,378
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		467,159
	Intangible assets, net		796,415
	Deferred tax liabilities, noncurrent		(112,233	)
	Noncontrolling interests		(427,813	)
	Goodwill		3,141,850
Business Acquisitions 2012
Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest	The following table summarizes the estimated aggregate fair values of the assets acquired, liabilities assumed and the noncontrolling interests as of the respective date of acquisition:
		RMB
		(In thousands)
	Purchase consideration		1,190,717
	Net assets acquired, excluding intangible assets and the related deferred tax liabilities		91,095
	Intangible assets, net		664,380
	Deferred tax liabilities, noncurrent		(72,222	)
	Noncontrolling interests		(32,507	)
	Redeemable noncontrolling interests		(100,101	)
	Pre-existing equity method investments		(817,951	)
	Goodwill		1,458,023

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investments Classified as Held-to-Maturity Securities and Available-for-Sale Securities	The short-term held-to-maturity debt investments as well as the short-term available-for-sale debt investments will mature within one year; whereas the long-term held-to-maturity debt investments as well as the long-term available-for-sale debt investments will mature after one year through five years.
		As of December 31, 2013
		Amortized		Gross		Gross			Gross			Fair
		cost		unrecognized		unrecognized			unrealized			value
				holding		holding			gains
				gains		losses
		RMB		RMB		RMB			RMB			RMB
		(In thousands)
	Short-term investments
	Held-to-maturity investments
	Fixed-rate investments		19,339,250		51,897		(21,080	)					19,370,067
	Available-for-sale investments
	Fixed-rate debt investments		7,603,087							24,871			7,627,958
	Adjustable-rate debt investments		514,433							—			514,433
	Equity investments		604,878							648,242			1,253,120
		As of December 31, 2014
		Amortized		Gross		Gross			Gross			Fair		Fair
		cost		unrecognized		unrecognized			unrealized			value		value
				holding		holding			gains(losses)
				gains		losses
		RMB		RMB		RMB			RMB			RMB		US$
		(In thousands)
	Short-term investments
	Held-to-maturity investments
	Fixed-rate investments		38,159,394		104,718		(15,389	)					38,248,723		6,164,575
	Adjustable-rate investments		60,290		—		(771	)					59,519		9,593
	Available-for-sale investments
	Fixed-rate debt investments		2,854,682							10,414			2,865,096		461,770
	Adjustable-rate debt investments		1,568,812							(269	)		1,568,543		252,803
	Equity investments		630,919							533,795			1,164,714		187,718
	Long-term investments:
	Held-to-maturity investments
	Fixed-rate investments		545,930		—		(14,612	)					531,318		85,633
	Available-for-sale investments
	Debt investment		272,680							—			272,680		43,948
	Equity investment		124,000							(8,079	)		115,921		18,683

Accounts_Receivable_Tables

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Schedule of Accounts Receivable
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Accounts receivable		2,264,660			3,758,324			605,732
	Allowance for doubtful accounts		(43,814	)		(93,877	)		(15,130	)
			2,220,846			3,664,447			590,602
Movements in Allowance for Doubtful Accounts Balance	The movements in the allowance for doubtful accounts were as follows:
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Balance as of January 1		5,806			5,768			43,814			7,062
	Amounts (credited against) charged to expenses		(38	)		38,046			50,063			8,068
	Balance as of December 31		5,768			43,814			93,877			15,130

Other_Current_Assets_Tables

Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets
		As of December 31,
		2013		2014		2014
		RMB		RMB		US$
		(In thousands)
	Prepaid expenses		217,918		420,227		67,728
	Advances to suppliers		539,608		1,225,972		197,591
	Tax prepayments		266,630		323,618		52,158
	Receivable from online payment agencies		501,813		689,025		111,051
	Others		309,296		748,585		120,649
			1,835,265		3,407,427		549,177

Fixed_Assets_Tables

Fixed Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Fixed Assets
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Computer equipment		6,562,127			9,764,297			1,573,719
	Office building		911,482			1,776,651			286,344
	Office building related facility, machinery and equipment		158,174			577,178			93,024
	Vehicles		14,996			29,363			4,732
	Office equipment		242,065			342,452			55,193
	Leasehold improvements		234,180			311,076			50,136
	Construction in progress		1,199,086			1,783,641			287,471
			9,322,110			14,584,658			2,350,619
	Accumulated depreciation		(3,951,842	)		(5,879,294	)		(947,569	)
			5,370,268			8,705,364			1,403,050

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill were as follows:
		2012			2013			2014		2014
		RMB			RMB			RMB		US$
		(In thousands)
	Balance as of January 1		2,419,542			3,877,564			16,864,350		2,718,040
	Goodwill acquired		1,458,023			12,986,790			554,541		89,376
	Foreign currency translation adjustment		(1	)		(4	)		4		—
	Balance as of December 31		3,877,564			16,864,350			17,418,895		2,807,416
Finite-Lived Intangible Assets	Finite-lived intangible assets
		As of December 31, 2013
		Gross carrying			Accumulated			Net carrying
		value			amortization			value
		RMB			RMB			RMB
		(In thousands)
	Land use right		519,474			(26,968	)		492,506
	Customer relationships		682,715			(144,451	)		538,264
	Software		478,909			(152,711	)		326,198
	Trademarks		821,338			(97,122	)		724,216
	User list		789,975			(219,377	)		570,598
	Licensed copyrights of video contents		1,012,534			(469,787	)		542,747
	Others		496,439			(71,063	)		425,376
			4,801,384			(1,181,479	)		3,619,905
		As of December 31, 2014
		Gross carrying			Accumulated			Net carrying		Net
		value			amortization			value		carrying
										value
		RMB			RMB			RMB		US$
		(In thousands)
	Land use right		519,474			(37,357	)		482,117		77,703
	Customer relationships		693,712			(304,208	)		389,504		62,777
	Software		519,239			(274,818	)		244,421		39,394
	Trademarks		916,735			(189,588	)		727,147		117,195
	User list		854,467			(452,730	)		401,737		64,748
	Licensed copyrights of video contents		1,768,141			(935,238	)		832,903		134,239
	Others		695,562			(213,929	)		481,633		77,625
			5,967,330			(2,407,868	)		3,559,462		573,681
Estimated Amortization Expense Relating to Existing Intangible Assets with Finite Lives	Estimated amortization expense relating to the existing intangible assets with finite lives for each of the next five years is as follows:
		RMB			US$
		(In thousands)
	For the years ending December 31,
	2015		1,234,976			199,042
	2016		798,198			128,646
	2017		340,619			54,898
	2018		233,781			37,679
	2019		159,471			25,702
Indefinite-Lived Intangible Assets	Indefinite-lived intangible assets
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Domain names		9,360			9,360			1,509
	Trademarks		1,050			5,537			892
			10,410			14,897			2,401

Accounts_Payable_and_Accrued_L1

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities
		As of December 31,
		2013		2014		2014
		RMB		RMB		US$
		(In thousands)
	Accrued payroll and welfare		759,952		1,703,029		274,478
	Accrued operating expenses		2,279,812		3,694,869		595,505
	Tax payable		428,801		624,781		100,696
	Interest payable		108,554		121,907		19,648
	Distributors’ deposits		76,925		171,791		27,688
	Purchase of fixed assets and spare parts		966,585		1,314,841		211,914
	Traffic acquisition costs		640,643		1,159,362		186,855
	Bandwidth costs		433,647		748,072		120,567
	Content acquisition costs		481,461		718,072		115,732
	Fund collected on behalf of service providers		438,211		1,563,564		252,001
	Payable to group-buying merchants		229,693		359,190		57,891
	Others		517,854		785,415		126,587
			7,362,138		12,964,893		2,089,562

Notes_Payable_Tables

Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long Term Loans Principal Repayments	The following table summarizes the aggregate required repayments of the principal amounts of the Company’s long-term debts, including the notes payable and loans payable (Note 10), in the succeeding five years and thereafter:
		RMB		US$
		(In thousands)
	For the years ending December 31,
	2015		2,171,610		350,000
	2016		930,690		150,000
	2017		5,584,140		900,000
	2018		6,204,600		1,000,000
	2019		6,204,600		1,000,000
	Thereafter		4,653,450		750,000

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income (Loss) Before Income Taxes	The Company had minimal operations in jurisdictions other than the PRC. Income (loss) before income taxes consists of:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	PRC		12,537,331			13,815,469			17,783,174			2,866,128
	Non-PRC		(571,894	)		(1,630,453	)		(3,308,631	)		(533,254	)
			11,965,437			12,185,016			14,474,543			2,332,874
Components of Income Tax	Income taxes consist of:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Current income tax		1,888,378			2,006,980			2,942,173			474,192
	Income tax refund due to reduced tax rate		(255,189	)		(508,686	)		(17,553	)		(2,829	)
	Adjustments of deferred tax assets due to reduced tax rates		—			21,573			28,146			4,536
	Deferred income tax (benefit) expense		(59,030	)		309,063			(721,594	)		(116,300	)
			1,574,159			1,828,930			2,231,172			359,599
Reconciliation of Effective Income Tax Provision of Tax Computed By Applying Statutory Income Tax Rate to Pre-Tax Income	The reconciliation of the effective income tax provision to the amount of tax computed by applying the aforementioned statutory income tax rate to pre-tax income is as follows:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands, except for per share data)
	Expected taxation at PRC EIT statutory rate		2,991,359			3,046,254			3,587,693			578,231
	Effect of differing tax rates in different jurisdictions		138,931			312,938			676,663			109,058
	Permanent differences – non-taxable income		(58,157	)		(69,673	)		(12,504	)		(2,015	)
	Permanent differences – non-deductible expenses		58,201			168,735			123,245			19,864
	Tax incentives relating to research and development expenditures		(154,977	)		(318,652	)		(538,305	)		(86,759	)
	Effect of preferential tax rates inside the PRC		(1,489,331	)		(2,152,806	)		(1,897,184	)		(305,771	)
	Effect of tax rate changes on deferred taxes		—			21,573			28,146			4,536
	Over-accrued EIT for previous years		(15,084	)		(32,982	)		(153,121	)		(24,679	)
	Withholding tax on PRC subsidiaries’ undistributed earnings		—			560,243			—			—
	Addition to valuation allowance		103,217			293,300			416,539			67,134
	Taxation for the year		1,574,159			1,828,930			2,231,172			359,599
	Effective tax rate		13.16	%		15.01	%		15.41	%		15.41	%
	Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share		42.63			61.53			53.61			8.64
Tax Effects of Temporary Differences that Give Rise to Deferred Tax Balances	The tax effects of temporary differences that give rise to the deferred tax balances at December 31, 2013 and 2014 are as follows:
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Deferred tax assets, current:
	Provision for doubtful receivables		10,670			23,179			3,736
	Net operating loss carry-forward		—			24,666			3,975
	Accrued expenses, payroll and others		316,092			777,478			125,307
	Less: valuation allowance		(39,918	)		(140,371	)		(22,624	)
	Current deferred tax assets, net		286,844			684,952			110,394
	Deferred tax assets, non-current:
	Fixed assets depreciation		28,755			38,157			6,150
	Net operating loss carry-forward		580,963			905,790			145,987
	Advertising expenses and others		163,591			306,635			49,420
	Less: valuation allowance		(675,369	)		(991,455	)		(159,793	)
	Non-current deferred tax assets, net		97,940			259,127			41,764
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Long-lived assets arising from acquisitions		619,550			549,485			88,561
	Withholding tax on PRC subsidiaries’ undistributed earnings		580,720			594,336			95,789
	Deferred tax liabilities		1,200,270			1,143,821			184,350

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Payments Under Non-cancelable Operating Leases with Initial Terms of One-Year or More	Future minimum payments under non-cancelable operating leases with initial terms of one-year or more consist of the following as of December 31, 2014:
		RMB		US$
		(In thousands)
	2015		2,418,879		389,853
	2016		1,160,152		186,983
	2017		748,230		120,593
	2018		593,102		95,591
	2019		291,077		46,913
	Thereafter		170,008		27,400
			5,381,448		867,333
Future Minimum Lease Payments For Non-cancelable Licensing Agreements	Future minimum payments under non-cancelable licensing agreements consist of the following as of December 31, 2014:
		RMB		US$
		(In thousands)
	2015		2,154,666		347,269
	2016 and thereafter		—		—
			2,154,666		347,269

Redeemable_Noncontrolling_Inte1

Redeemable Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2014
Temporary Equity Disclosure [Abstract]
Summary of Redeemable Noncontrolling Interest		2012				2013				2014
			RMB				RMB				RMB		US$
			(In thousands)
	Balance as of January 1			935,978				1,033,283				—		—
	Business combination			100,101				—				—		—
	Net losses			(55,804	)			(61,857	)			—		—
	Other comprehensive losses			(690	)			(55,420	)			—		—
	Exercise of share-based awards			—				464				—		—
	Share-based compensation			5,566				11,259				—		—
	Issuance of subsidiary shares (1)			25,989				51,368				1,841,819		296,845
	Accretion of redeemable noncontrolling interests (1)			22,143				31,799				52,683		8,493
	Acquisition of subsidiaries’ redeemable shares from noncontrolling shareholders			—				(121,962	)			—		—
	Reclassification of redeemable noncontrolling interests			—				(888,934	)			—		—
	Balance as of December 31			1,033,283				—				1,894,502		305,338
	-1	On November 14, 2014, Qiyi completed a round of preferred shares financing. The new preferred shareholders acquired 13.42% of the then outstanding equity interest of Qiyi for a total consideration of US$300 million. The newly issued preferred shares could be redeemed by such shareholders upon the occurrence of certain events that are not solely within the control of Qiyi and are accounted for as redeemable noncontrolling interests. The Company accounts for the accrete changes in the redemption value in accordance with ASC topic 480 (“ASC 480”), Distinguishing Liabilities from Equity. The Company elects to use the effective interest method for the changes of redemption value over the period from the date of issuance to the earliest redemption date of the noncontrolling interest.

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Retained Earnings	The reserves are not allowed to be transferred to the Company in terms of cash dividends, loans or advances, nor are they allowed for distribution except under liquidation.
		As of December 31,
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	PRC statutory reserve funds		321,206			375,193			60,470
	Unreserved retained earnings		34,204,180			47,284,579			7,620,891
	Total retained earnings		34,525,386			47,659,772			7,681,361
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax	The changes in accumulated other comprehensive income (loss) by component, net of tax, were as follows:
		Foreign			Unrealized			Total
		currency			gains on
		translation			available-for-
		adjustment			sale
					investments
		RMB			RMB			RMB
		(In thousands)
	Balance at December 31, 2012		(89,714	)		11,436			(78,278	)
	Other comprehensive income before reclassification		190,322			730,504			920,826
	Amounts reclassified from accumulated other comprehensive income		—			(62,132	)		(62,132	)
	Net current-period other comprehensive income		190,322			668,372			858,694
	Other comprehensive income attribute to noncontrolling interests		62,680			—			62,680
	Balance at December 31, 2013		163,288			679,808			843,096
	Other comprehensive loss before reclassification		(445,710	)		(100,285	)		(545,995	)
	Amounts reclassified from accumulated other comprehensive income		—			(45,025	)		(45,025	)
	Net current-period other comprehensive loss		(445,710	)		(145,310	)		(591,020	)
	Other comprehensive income attribute to noncontrolling interests		(20,153	)		—			(20,153	)
	Balance at December 31, 2014		(302,575	)		534,498			231,923
	Balance at December 31, 2014, in US$		(48,766	)		86,145			37,379
Tax Effect Allocated to Each Component of Other Comprehensive Income	The following table sets forth the tax effect allocated to each component of other comprehensive income for the years ended December 31, 2013 and 2014:
		Tax effect
		2013			2014			2014
		RMB			RMB			US$
		(In thousands)
	Unrealized gains on available-for-sale investments
	Unrealized holding gains during the year		(1,157	)		1,680			271
	Reclassified for gains realized		—			—			—
	Net unrealized gains		(1,157	)		1,680			271
	Foreign currency translation adjustment		—			—			—
	Other comprehensive income (loss)		(1,157	)		1,680			271

Earnings_Per_Share_EPS_Tables

Earnings Per Share ("EPS") (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Reconciliation of Net Income to Numerator for Computation of Basic and Diluted Net Income per Share	A reconciliation of net income attributable to Baidu, Inc. in the consolidated statements of comprehensive income to the numerator for the computation of basic and diluted per share for the years ended December 31, 2012, 2013 and 2014 is as follows:
		For the years ended December 31,
		2012			2013			2014			2014
		RMB			RMB			RMB			US$
		(In thousands)
	Net income attributable to Baidu, Inc.		10,456,028			10,518,966			13,187,069			2,125,372
	Accretion of the redeemable noncontrolling interests		(22,143	)		(31,799	)		(52,683	)		(8,493	)
	Numerator for EPS computation		10,433,885			10,487,167			13,134,386			2,116,879
Computation of Basic and Diluted Net Income Attributable to Baidu, Inc. Per Share for Class A and Class B Ordinary Shares	The following table sets forth the computation of basic and diluted net income attributable to Baidu, Inc. per share for Class A and Class B ordinary shares.
		For the years ended December 31,
		2012						2013						2014
		Class A			Class B			Class A			Class B			Class A		Class A		Class B		Class B
		RMB			RMB			RMB			RMB			RMB		US$		RMB		US$
		(In thousands, except for number of shares, per share and per ADS data)
	Earnings per share – basic:
	Numerator
	Allocation of net income attributable to Baidu, Inc.		8,106,219			2,327,666			8,175,647			2,311,520			10,320,767		1,663,406		2,813,619		453,473
	Denominator
	Weighted average ordinary shares outstanding		27,145,208			7,794,630			27,274,769			7,711,459			27,551,463		27,551,463		7,511,003		7,511,003
	Denominator used for earnings per share		27,145,208			7,794,630			27,274,769			7,711,459			27,551,463		27,551,463		7,511,003		7,511,003
	Earnings per share – basic		298.62			298.62			299.75			299.75			374.6		60.37		374.6		60.37
	Earnings per share – diluted:
	Numerator
	Allocation of net income attributable to Baidu, Inc. for diluted computation		8,108,856			2,325,029			8,178,954			2,308,213			10,331,639		1,665,158		2,802,747		451,721
	Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares		2,325,029			—			2,308,213			—			2,802,747		451,721		—		—
	Allocation of net income attributable to Baidu, Inc.		10,433,885			2,325,029			10,487,167			2,308,213			13,134,386		2,116,879		2,802,747		451,721
	Denominator
	Weighted average ordinary shares outstanding		27,145,208			7,794,630			27,274,769			7,711,459			27,551,463		27,551,463		7,511,003		7,511,003
	Conversion of Class B to Class A ordinary shares		7,794,630			—			7,711,459			—			7,511,003		7,511,003		—		—
	Share-based awards		39,621			—			50,118			—			136,008		136,008		—		—
	Denominator used for earnings per share		34,979,459			7,794,630			35,036,346			7,711,459			35,198,474		35,198,474		7,511,003		7,511,003
	Earnings per share – diluted		298.29			298.29			299.32			299.32			373.15		60.14		373.15		60.14
	Earnings per ADS:
	Denominator used for earnings per ADS – basic		271,452,080						272,747,690						275,514,630		275,514,630
	Denominator used for earnings per ADS – diluted		349,794,590						350,363,460						351,984,740		351,984,740
	Earnings per ADS – basic		29.86						29.98						37.46		6.04
	Earnings per ADS – diluted		29.83						29.93						37.32		6.01

ShareBased_Awards_Plan_Tables

Share-Based Awards Plan (Tables)	12 Months Ended
	Dec. 31, 2014
Total Share-Based Compensation Cost Recognized	The following table summarizes the total compensation cost recognized by the Group:
		For the years ended December 31,
		2012			2013		2014		2014
		RMB			RMB		RMB		US$
		(In thousands)
	Expensed as cost of revenues		10,105			23,976		34,611		5,578
	Expensed as selling, general and administrative		54,512			164,704		426,052		68,667
	Expensed as research and development		147,692			326,047		502,077		80,921
	Capitalized as part of internal-used software		1,944			229		—		—
Baidu, Inc.
Option Activity	The following table summarizes the option activity for the year ended December 31, 2014:
		Number			Weighted		Weighted		Aggregate
		of shares			average		average		intrinsic
					exercise		remaining		value (US$ in
					price		contractual		thousands)
					(US$)		life (Years)
	Share options
	Outstanding, December 31, 2013		232,572			1,042.90		8.62		171,156
	Granted		19,477			1,916.10
	Exercised		(30,819	)		942.1
	Forfeited/Cancelled		(22,838	)		1,071.40
	Outstanding, December 31, 2014		198,392			1,141.00		7.83		225,915
	Vested and expected to vest at December 31, 2014		171,597			1,139.30		7.8		195,684
	Exercisable at December 31, 2014		66,993			1,003.30		7.14		85,509
Assumptions Used to Estimate Fair Values of Share Options Granted	The following table presents the assumptions used to estimate the fair values of the share options granted in the years presented:
		2012			2013		2014
	Risk-free interest rate		0.35%~0.43%			0.40%~1.35%		1.52%~1.77%
	Dividend yield		—			—		—
	Expected volatility range		43.60%~44.72%			42.33%~44.17%		40.96%~41.59%
	Weighted average expected volatility		43.75%			43.33%		41.36%
	Expected life (in years)		2.67~3.08			3.08~4.57		4.57
Restricted Shares Activity	Restricted shares activity for the year ended December 31, 2014 was as follows:
		Number of			Weighted
		shares			average grant
					date fair
					value (US$)
	Restricted shares
	Unvested, December 31, 2013		146,510			1,151.40
	Granted		152,852			1,815.60
	Vested		(45,161	)		1,157.70
	Forfeited		(34,797	)		1,346.10
	Unvested, December 31, 2014		219,404			1,582.60
Qunar
Option Activity	The following table summarizes Qunar’s option activity for the year ended December 31, 2014:
		Number of			Weighted		Weighted		Aggregate
		shares			average		average		intrinsic
					exercise		remaining		value (US$
					price		contractual		in
					(US$)		life (Years)		thousands)
	Qunar’s share options
	Outstanding, December 31, 2013		25,192,696			1.4		7.39		184,355
	Granted		9,993,411			0.01
	Exercised		(8,907,408	)		0.27
	Forfeited/Cancelled		(1,115,256	)		0.02
	Outstanding, December 31, 2014		25,163,443			1.3		7.89		201,417
	Vested and expected to vest at December 31, 2014		21,880,749			1.43		7.75		176,072
	Exercisable at December 31, 2014		9,685,685			1.72		6.62		75,118
Assumptions Used to Estimate Fair Values of Share Options Granted	The following table presents the assumptions used to estimate the fair values of the share options granted in the years presented:
		2012			2013		2014
	Risk-free interest rate		1.70%~2.28%			1.91%~2.71%		1.91%~2.07%
	Dividend yield		—			—		—
	Expected volatility range		48.03%~49.84%			46.68%~47.66%		45.78%~46.58%
	Expected life (in years)		10			10		6.11

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Revenues and Long-Lived Assets, by Geographical Areas	The following table sets forth revenues by geographic area:
		For the years ended December 31,
		2012		2013		2014		2014
		RMB		RMB		RMB		US$
		(In thousands)
	Revenues:
	PRC		22,198,685		31,875,202		48,793,898		7,864,149
	Non-PRC		107,341		68,722		258,420		41,650
	The following table sets forth long-lived assets by geographic area:
		As of December 31,
		2013		2014		2014
		RMB		RMB		US$
		(In thousands)
	Long-lived assets:
	PRC		5,355,157		9,466,458		1,525,716
	Non-PRC		56,143		84,949		13,691

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Disclosure and Measurement	Assets and liabilities measured or disclosed at fair value are summarized below:
		Total fair		Fair value measurement or disclosure
		value at		at December 31, 2013 using
		December 31,
		2013		Quoted prices		Significant other		Significant		Total losses
				in active		observable		unobservable
				markets for		inputs		inputs
				identical		(Level 2)		(Level 3)
				assets
				(Level 1)
		RMB		RMB		RMB		RMB		RMB
		(In thousands)
	Fair value disclosure (Notes 2 and 4)
	Cash equivalents
	Time deposits		2,955,924				2,955,924
	Money market fund		689,254		689,254
	Short-term investments Held-to-maturity investments
	Fixed-rate investments		19,370,067				19,370,067
	Long-term notes payable		14,797,937		14,797,937
	Fair value measurement
	Recurring
	Short-term investments Available-for-sale investments
	Fixed-rate debt investments		7,627,958				7,627,958
	Adjustable-rate debt investments		514,433				514,433
	Equity investment		1,253,120		1,253,120
	Non-recurring
	Long-term investments		—						—		(17,521	)
	Fixed assets		—						—		(2,057	)
	Intangible assets		—						—		(4,619	)
	Total assets measured at fair value		9,395,511		1,253,120		8,142,391		—		(24,197	)
	The Company has no assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2013.
	As of December 31, 2013, certain fixed assets (Note 7), intangible assets (Note 8), cost method investments (Note 4) and equity method investments (Note 4) were measured using significant unobservable inputs (Level 3) and written down from their respective carrying value to fair value of nil, with impairment charges incurred and recorded in earnings for the year then ended.
		Total fair value at				Fair value measurement or disclosure
		December 31, 2014				at December 31, 2014 using
						Quoted prices in		Significant other		Significant			Total losses
						active markets		observable		unobservable
						for identical		inputs		inputs
						assets (Level 1)		(Level 2)		(Level 3)
		RMB		US$		RMB		RMB		RMB			RMB			US$
		(In thousands)
	Fair value disclosure (Notes 2 and 4)
	Cash equivalents
	Time deposits		1,746,888		281,547				1,746,888
	Money market fund		755,095		121,699		755,095
	Short-term investments Held-to-maturity investments
	Fixed-rate investments		38,248,723		6,164,575				38,248,723
	Adjustable-rate investments		59,519		9,593				59,519
	Long-term investments Held-to-maturity investments
	Fixed-rate investments		531,318		85,633				531,318
	Long-term notes payable		21,811,666		3,515,403		21,811,666
	Fair value measurement
	Recurring
	Short-term investments Available-for-sale investments
	Fixed-rate debt investments		2,865,096		461,770				2,865,096
	Adjustable-rate debt investments		1,568,543		252,803				1,568,543
	Equity investments		1,164,714		187,718		1,164,714
	Long-term investments Available-for-sale investments
	Debt investment		272,680		43,948						272,680
	Equity investment		115,921		18,683		115,921
	Non-recurring
	Long-term investments		—		—						—			(93,424	)		(15,057	)
	Intangible assets		—		—						—			(1,625	)		(262	)
	Total assets measured at fair value		5,986,954		964,922		1,280,635		4,433,639		272,680			(95,049	)		(15,319	)
Reconciliation of Available-For-Sale Debt Investments at Fair Value on a Recurring Basis Using Significant Unobservable Inputs	The following table presents a reconciliation of long-term available-for-sale debt investment at fair value on a recurring basis using significant unobservable inputs (Level 3).
		Long-term available-for-
		sale debt investment
		RMB		US$
		(In thousands)
	Balance as of January 1, 2014		—		—
	Recognized during the period		272,680		43,948
	Realized or unrealized gain (loss)		—		—
	Settlement		—		—
	Balance as of December 31, 2014		272,680		43,948

Organization_Consolidation_and2

Organization, Consolidation and Presentation of Financial Statements - Additional Information (Detail)	1 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	CNY	Baidu Netcom	Beijing Perusal	Baidu Pay
			CNY	CNY	CNY
Variable Interest Entity [Line Items]
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities			100	20	31.5
Equity pledge agreement expiration period			2 years	2 years	2 years
Net liabilities of VIEs	$56.36	349.67
Creditors of the VIEs'third-party liabilities with no recourse to the general credit of the primary beneficiaries	No	No
Exchange rate used for conversion of financial statements from RMB to US dollar	6.2046	6.2046

Assets_Liabilities_and_Results

Assets, Liabilities and Results of Operations of VIEs and Their Subsidiaries Included in Company's Consolidated Balance Sheets and Statements of Comprehensive Income (Detail)	12 Months Ended						12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
	USD ($)	CNY	CNY	CNY	USD ($)	CNY	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary	Variable Interest Entity, Primary Beneficiary
							USD ($)	CNY	CNY	CNY	Third-party Liabilities	Third-party Liabilities	Third-party Liabilities	Inter-company Liabilities	Inter-company Liabilities	Inter-company Liabilities
											USD ($)	CNY	CNY	USD ($)	CNY	CNY
Assets
Cash and cash equivalents	$2,232,654	13,852,725	9,691,797	11,880,632	$1,562,034	4,127,482	$362,682	2,250,298	1,510,320
Accounts receivable, net	590,602	3,664,447	2,220,846				442,380	2,744,793	1,373,443
Others							590,741	3,665,314	1,607,462
Total current assets	10,611,586	65,840,648	43,029,150				1,395,803	8,660,405	4,491,225
Fixed assets, net	1,403,050	8,705,364	5,370,268				289,489	1,796,162	1,350,852
Others							347,794	2,157,922	1,301,383
Total non-current assets	5,450,932	33,820,860	27,956,638				637,283	3,954,084	2,652,235
Total	16,062,518	99,661,508	70,985,788				2,033,086	12,614,489	7,143,460
Third-party liabilities
Accounts payable and accrued liabilities	2,089,562	12,964,893	7,362,138								978,803	6,073,083	2,944,821
Customer advances and deposits	692,460	4,296,440	2,977,872								129,317	802,362	801,626
Others											473,508	2,937,921	284,729
Total current liabilities	3,267,062	20,270,821	11,032,826				1,581,628	9,813,366	4,031,176		1,581,628	9,813,366	4,031,176
Non-current	4,010,750	24,885,099	19,287,712				126,009	781,835	975,793		126,009	781,835	975,793
Total	7,277,812	45,155,920	30,320,538								1,707,637	10,595,201	5,006,969	381,806	2,368,953	2,089,580
Inter-company liabilities
Inter-company payable to subsidiaries for technology consulting and service fees														238,440	1,479,423	1,578,759
Others														143,366	889,530	510,821
Total	7,277,812	45,155,920	30,320,538								1,707,637	10,595,201	5,006,969	381,806	2,368,953	2,089,580
Total revenues	7,905,799	49,052,318	31,943,924	22,306,026			2,122,089	13,166,712	9,040,058	6,429,099
Net income (loss)	1,973,275	12,243,371	10,356,086	10,391,278			-56,752	-352,125	-248,664	143,626
Net cash provided by operating activities	2,890,949	17,937,175	13,792,971	11,995,994			224,356	1,392,039	1,354,802	1,399,892
Net cash used in investing activities	-3,621,147	-22,467,774	-23,062,940	-13,749,080			-391,726	-2,430,505	-1,303,612	-1,033,164
Net cash (used in) provided by financing activities	$1,387,994	8,611,960	7,281,682	9,517,865			$286,633	1,778,444	595,132	-88,971

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail)

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

USD ($)

CNY

CNY

CNY

Online Payment Agencies

Online Payment Agencies

Cash and cash equivalents

Short-term Investments

Short-term Investments

Other Long-term Investments

Credit Concentration Risk

Onshore China

Offshore China

Office building related facility, machinery and equipment

Bank of China

China Merchants Bank

Unit

Unit

CNY

CNY

Maximum

Maximum

Minimum

Minimum

Sales Revenue, Net

Credit Concentration Risk

Credit Concentration Risk

Credit Concentration Risk

Credit Concentration Risk

Segment

Maximum

Financial Instruments

Financial Instruments

Financial Instruments

Financial Instruments

Accounting Policies [Abstract]

Number of operating segment

1

1

Maturity period used to classify cash and cash equivalent and investments

3 months

12 months

3 months

12 months

Allowance for doubtful accounts of online payment agencies

0

0

Fair value long-term notes payable

3,515,403,000

21,811,666,000

14,797,937,000

Internal use software development costs capitalized during the period

0

0

2,680,000

38,130,000

Amortization expense for capitalized software costs

4,550,000

28,240,000

31,650,000

19,720,000

Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net)

2,130,000

13,240,000

41,480,000

Property, plant and equipment, salvage value, percentage

4.00%

Number of reporting units the Company has

3

3

3

Sale tax and surcharges in cost of revenues

579,850,000

3,600,000,000

2,330,000,000

1,570,000,000

Advertising expenses

62,060,000

385,060,000

191,610,000

326,830,000

Cash and cash equivalents, restricted cash and short-term investments

$9,450,000,000

58,630,000,000

Concentration risk by percentage

10.00%

86.37%

13.63%

17.54%

31.26%

Appreciation of US$ against RMB, as a percentage

2.49%

2.49%

Estimated_Useful_Lives_of_Fixe

Estimated Useful Lives of Fixed Assets (Detail)	12 Months Ended
	Dec. 31, 2014
Office building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	45 years
Office building related facility, machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Office equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Office equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (description)	over the shorter of lease terms or estimated useful lives of the assets

Weighted_Average_Useful_Lives_

Weighted Average Useful Lives from Date of Purchase of Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2014
Land use right
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	50 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	5 years 6 months
Software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	4 years 2 months 12 days
Trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	9 years 9 months 18 days
User list
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	3 years 4 months 24 days
Licensed copyrights of video contents
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	3 years 4 months 24 days
Others
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset weighted average useful life	5 years 10 months 24 days

Summary_of_Estimated_Fair_Valu

Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Oct. 01, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	USD ($)	CNY	CNY	CNY	Business Acquisitions 2014	Business Acquisitions 2014	Business Acquisitions 2012	Series of Individually Immaterial Business Acquisitions	Acquisition of 91 Wireless 2013
							USD ($)	CNY	CNY	CNY	CNY
Business Acquisition [Line Items]
Business combination, purchase consideration							$64,212	398,410	1,190,717	3,865,378	11,196,235
Net assets acquired, excluding intangible assets and the related deferred tax liabilities							-15,466	-95,961	91,095	467,159	483,341
Intangible assets, net							40,204	249,452	664,380	796,415	1,146,300
Deferred tax liabilities, noncurrent							-10,951	-67,945	-72,222	-112,233	-278,346
Noncontrolling interests							-24,175	-150,000	-32,507	-427,813
Redeemable noncontrolling interests									-100,101
Pre-existing equity interests							-14,776	-91,677	-817,951
Goodwill	$2,807,416	17,418,895	$2,718,040	16,864,350	3,877,564	2,419,542	$89,376	554,541	1,458,023	3,141,850	9,844,940

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (Acquisition of 91 Wireless 2013, USD $)	0 Months Ended
	Oct. 01, 2013	Oct. 01, 2013
Acquisition of 91 Wireless 2013
Business Acquisition [Line Items]
Business combination, percentage of voting interests acquired	100.00%	100.00%
Business combination, cash paid upon acquisition	$1,830,000,000
Business combination, amount deposited in an escrow account	$10,000,000	$10,000,000
Business combination, escrow period	18 months

Investments_Shortterm_Investme

Investments - Short-term Investments - Additional information (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments
					USD ($)	CNY	CNY	CNY
Schedule of Investments [Line Items]
Investment interest income	$321,184	1,992,818	1,308,542	866,465	$291,590	1,810,000	1,070,000	726,400

Investments_Longterm_Investmen

Investments - Long-term Investments - Additional information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	CNY	CNY	CNY	Short-term Investments	Other Long-term Investments	Other Long-term Investments
					Maximum	Maximum	Minimum
Schedule of Investments [Line Items]
Carrying amount of cost method investments	$277,950,000	1,720,000,000	415,200,000
Carrying amount of equity method investments	35,430,000	219,840,000	219,580,000
Impairment charges on long-term investments	$15,060,000	93,420,000	17,520,000	169,180,000
Held-to-maturity debt investments maturity					1 year	5 years	1 year
Available for sale debt investments maturity					1 year	5 years	1 year

Investments_Detail

Investments (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
In Thousands, unless otherwise specified	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments	Short-term Investments	Other Long-term Investments	Other Long-term Investments	Other Long-term Investments	Other Long-term Investments	Other Long-term Investments	Other Long-term Investments
	Fixed-rate Investments	Fixed-rate Investments	Fixed-rate Investments	Adjustable-rate Debt Investments	Adjustable-rate Debt Investments	Adjustable-rate Debt Investments	Equity Investments	Equity Investments	Equity Investments	Fixed-rate Investments	Fixed-rate Investments	Equity Investments	Equity Investments	Debt Investment	Debt Investment
	USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	USD ($)	CNY	USD ($)	CNY
Gain (Loss) on Investments [Line Items]
Short-term held-to-maturity investments, amortized cost		38,159,394	19,339,250		60,290
Long-term held-to-maturities investments, amortized cost											545,930
Held-to-maturity investments, gross unrecognized holding gains		104,718	51,897		0						0
Held-to-maturity investments, gross unrecognized holding losses		-15,389	-21,080		-771						-14,612
Held-to-maturity investments, fair value	6,164,575	38,248,723	19,370,067	9,593	59,519					85,633	531,318
Available-for-sale investments, amortized cost		2,854,682	7,603,087		1,568,812	514,433		630,919	604,878				124,000		272,680
Available-for-sale investments, gross unrealized gains (losses)		10,414	24,871		-269	0		533,795	648,242				-8,079		0
Available-for-sale investments current, fair value	$461,770	2,865,096	7,627,958	$252,803	1,568,543	514,433	$187,718	1,164,714	1,253,120			$18,683	115,921	$43,948	272,680

Accounts_Receivable_Detail

Accounts Receivable (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	USD ($)	CNY	USD ($)	CNY	CNY	CNY
Receivables [Abstract]
Accounts receivable	$605,732	3,758,324		2,264,660
Allowance for doubtful accounts	-15,130	-93,877	-7,062	-43,814	-5,768	-5,806
Accounts receivable, net	$590,602	3,664,447		2,220,846

Movement_in_Allowance_for_Doub

Movement in Allowance for Doubtful Accounts (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Allowance for Doubtful Accounts
Balance as of January 1	$7,062	43,814	5,768	5,806
Amounts (credited against) charged to expenses	8,068	50,063	38,046	-38
Balance as of December 31	$15,130	93,877	43,814	5,768

Other_Current_Assets_Detail

Other Current Assets (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$67,728	420,227	217,918
Advances to suppliers	197,591	1,225,972	539,608
Tax prepayments	52,158	323,618	266,630
Receivable from online payment agencies	111,051	689,025	501,813
Others	120,649	748,585	309,296
Other assets, current	$549,177	3,407,427	1,835,265

Fixed_Assets_Detail

Fixed Assets (Detail)

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

In Thousands, unless otherwise specified

USD ($)

CNY

CNY

Computer equipment

Computer equipment

Computer equipment

Office building

Office building

Office building

Office building related facility, machinery and equipment

Office building related facility, machinery and equipment

Office building related facility, machinery and equipment

Vehicles

Vehicles

Vehicles

Office equipment

Office equipment

Office equipment

Leasehold improvements

Leasehold improvements

Leasehold improvements

Construction in Progress

Construction in Progress

Construction in Progress

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

Property, Plant and Equipment [Line Items]

Property, plant and equipment, gross

$2,350,619

14,584,658

9,322,110

$1,573,719

9,764,297

6,562,127

$286,344

1,776,651

911,482

$93,024

577,178

158,174

$4,732

29,363

14,996

$55,193

342,452

242,065

$50,136

311,076

234,180

$287,471

1,783,641

1,199,086

Accumulated depreciation

-947,569

-5,879,294

-3,951,842

Fixed assets, net

$1,403,050

8,705,364

5,370,268

Fixed_Assets_Additional_Inform

Fixed Assets - Additional Information (Detail)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Property, Plant and Equipment [Abstract]
Capital leases, asset gross	$36.11	224.03	149.67
Capital leases, accumulated depreciation	19.73	122.43	59.46
Capital leases, future minimum lease payments		103.48
Capital leases, future minimum lease payments due in 2015		57.32
Capital leases, future minimum lease payments due in 2016		39.39
Capital leases, future minimum lease payments due in 2017		6.77
Capital leases, future minimum lease payments due in 2018		0
Capital leases, future minimum lease payments due in 2019		0
Fixed assets, depreciation expense	353.77	2,190	1,640	1,200
Impairment loss on fixed assets		0	2.06	0

Changes_in_Carrying_Amount_of_

Changes in Carrying Amount of Goodwill (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Goodwill [Roll Forward]
Balance as of January 1	$2,718,040	16,864,350	3,877,564	2,419,542
Goodwill acquired	89,376	554,541	12,986,790	1,458,023
Foreign currency translation adjustment	0	4	-4	-1
Balance as of December 31	$2,807,416	17,418,895	16,864,350	3,877,564

FiniteLived_Intangible_Assets_

Finite-Lived Intangible Assets (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY	Land use right	Land use right	Land use right	Customer relationships	Customer relationships	Customer relationships	Software	Software	Software	Trademarks	Trademarks	Trademarks	User list	User list	User list	Licensed copyrights of video contents	Licensed copyrights of video contents	Licensed copyrights of video contents	Others	Others	Others
				USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	CNY	USD ($)	CNY	CNY
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying value		5,967,330	4,801,384		519,474	519,474		693,712	682,715		519,239	478,909		916,735	821,338		854,467	789,975		1,768,141	1,012,534		695,562	496,439
Finite-lived intangible assets, accumulated amortization		-2,407,868	-1,181,479		-37,357	-26,968		-304,208	-144,451		-274,818	-152,711		-189,588	-97,122		-452,730	-219,377		-935,238	-469,787		-213,929	-71,063
Finite-lived intangible assets, net carrying value	$573,681	3,559,462	3,619,905	$77,703	482,117	492,506	$62,777	389,504	538,264	$39,394	244,421	326,198	$117,195	727,147	724,216	$64,748	401,737	570,598	$134,239	832,903	542,747	$77,625	481,633	425,376

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Additional Information (Detail)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Amortization Of Intangible Assets Disclosure [Abstract]
Impairment loss on intangible assets	$0.26	1.63	4.62	0
Amortization expense of intangible assets	$255.48	1,590	949.85	234

Estimated_Amortization_Expense

Estimated Amortization Expense Relating to Existing Intangible Assets with Finite Lives (Detail)	Dec. 31, 2014	Dec. 31, 2014
In Thousands, unless otherwise specified	USD ($)	CNY
Estimated amortization expense
2015	$199,042	1,234,976
2016	128,646	798,198
2017	54,898	340,619
2018	37,679	233,781
2019	$25,702	159,471

IndefiniteLived_Intangible_Ass

Indefinite-Lived Intangible Assets (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY	Domain names	Domain names	Domain names	Trademarks	Trademarks	Trademarks
				USD ($)	CNY	CNY	USD ($)	CNY	CNY
Indefinite-lived intangible assets, gross	$2,401	14,897	10,410	$1,509	9,360	9,360	$892	5,537	1,050

Accounts_Payable_and_Accrued_L2

Accounts Payable and Accrued Liabilities (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY
Payables and Accruals [Abstract]
Accrued payroll and welfare	$274,478	1,703,029	759,952
Accrued operating expenses	595,505	3,694,869	2,279,812
Tax payable	100,696	624,781	428,801
Interest payable	19,648	121,907	108,554
Distributors' deposits	27,688	171,791	76,925
Purchase of fixed assets and spare parts	211,914	1,314,841	966,585
Traffic acquisition costs	186,855	1,159,362	640,643
Bandwidth costs	120,567	748,072	433,647
Content acquisition costs	115,732	718,072	481,461
Fund collected on behalf of service providers	252,001	1,563,564	438,211
Payable to group-buying merchants	57,891	359,190	229,693
Others	126,587	785,415	517,854
Accounts payable and accrued liabilities	$2,089,562	12,964,893	7,362,138

Loans_Payable_Additional_Infor

Loans Payable - Additional Information (Detail)

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Aug. 19, 2013

Oct. 17, 2012

Aug. 19, 2013

Aug. 19, 2013

Aug. 19, 2013

Aug. 13, 2013

Aug. 13, 2013

Oct. 17, 2012

Oct. 17, 2012

Oct. 17, 2012

Sep. 18, 2012

Sep. 18, 2012

13-May-14

Sep. 25, 2014

Sep. 25, 2014

23-May-14

23-May-14

13-May-14

13-May-14

Jul. 29, 2013

Jul. 29, 2013

Jul. 29, 2013

Jul. 24, 2013

Jul. 24, 2013

Dec. 09, 2014

Dec. 09, 2014

Dec. 09, 2014

Dec. 09, 2014

Dec. 09, 2014

Dec. 09, 2014

Dec. 09, 2014

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

ANZ Bank Loan

HSBC Bank Loan

HSBC Bank Loan

HSBC Bank Loan

HSBC Bank Loan

HSBC Bank Loan

HSBC Bank Loan

HSBC Bank Loan

Sumitomo Mitsui Bank Loan

Sumitomo Mitsui Bank Loan

Sumitomo Mitsui Bank Loan

Sumitomo Mitsui Bank Loan

Sumitomo Mitsui Bank Loan

Bank of China

Bank of China

Bank of China

Bank of China

Bank of China

Bank of China

Bank of China

USD ($)

AUD

CNY

AUD

CNY

USD ($)

AUD

CNY

AUD

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

Agreement

Unsecured Loan 1

Unsecured Loan 1

Unsecured Loan 1

Unsecured Loan 2

Unsecured Loan 2

Unsecured Loan 2

Loan

USD ($)

CNY

USD ($)

CNY

Debt Instrument [Line Items]

Specific amount up to which borrowings can be made under the commitment of a bank loan

235

1,190

105

532.46

$20

124.09

$150

930.69

The percentage points added to LIBOR to compute the floating interest rate per annum

0.80%

Amount borrowed under the commitment of a bank loan

235

1,190

55

278.91

8

49.6

7

43.4

150

930.69

150

930.69

150

930.69

Annual interest rate

1.65%

1.65%

1.65%

2.75%

2.75%

2.75%

1.13%

1.13%

1.12%

1.12%

1.17%

1.17%

2.31%

2.31%

2.45%

2.45%

Loan commitment amount cancelled

50

Unsecured loan borrowed

$200

$56.76

Unsecured loan, maturity period (in years)

2 years

2 years

2 years

2 years

3 years

Number of loan agreements

2

Number of unsecured loan

2

Number of interest rate swap agreements

2

Notes_Payable_Additional_Infor

Notes Payable - Additional Information (Detail)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2014

Nov. 28, 2012

Dec. 31, 2014

Nov. 28, 2012

Dec. 31, 2014

Aug. 06, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Nov. 28, 2012

Dec. 31, 2014

Jun. 09, 2014

Unsecured Senior Notes Due Two Thousand Seventeen

Unsecured Senior Notes Due Two Thousand Seventeen

Unsecured Senior Notes Due Two Thousand Twenty Two

Unsecured Senior Notes Due Two Thousand Twenty Two

Unsecured Senior Notes Due Twenty Eighteen

Unsecured Senior Notes Due Twenty Eighteen

Unsecured Senior Notes

Unsecured Senior Notes

Unsecured Senior Notes

Unsecured Senior Notes

Unsecured Senior Notes

Unsecured Senior Notes Due Twenty Nineteen

Unsecured Senior Notes Due Twenty Nineteen

USD ($)

USD ($)

USD ($)

USD ($)

CNY

CNY

CNY

Tranche

USD ($)

Debt Instrument [Line Items]

Number of tranches issued and sold

2

Debt face amount

$750,000,000

$750,000,000

$1,000,000,000

$1,000,000,000

Debt, maturity date

28-Nov-17

28-Nov-22

6-Aug-18

9-Jun-19

Interest rate

2.25%

3.50%

3.25%

2.75%

Net proceeds from issuance of debt

990,000,000

6,190,000,000

6,110,000,000

9,330,000,000

Discount on debt issued

10,130,000

62,840,000

Debt issuance cost

$17,670,000

109,630,000

Effective interest rate

2.36%

3.59%

3.39%

3.00%

Repayment_of_Principal_Amount_

Repayment of Principal Amount of Long Term Debts (Detail) (Long Term Debt)	Dec. 31, 2014	Dec. 31, 2014
In Thousands, unless otherwise specified	USD ($)	CNY
Long Term Debt Maturities Repayments Of Principal [Line Items]
2015	$350,000	2,171,610
2016	150,000	930,690
2017	900,000	5,584,140
2018	1,000,000	6,204,600
2019	1,000,000	6,204,600
Thereafter	$750,000	4,653,450

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)

12 Months Ended

12 Months Ended

36 Months Ended

12 Months Ended

24 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

USD ($)

CNY

CNY

Baidu Japan

Certain PRC Subsidiaries and VIEs

Certain PRC Subsidiaries and VIEs

Certain PRC Subsidiaries and VIEs

Certain PRC Subsidiaries and VIEs

Baidu Online

China

China

China

China

Japan

Japan

Japan

Japan

JPY (¥)

High And New Technology Enterprise

Expiration Period One

Expiration Period Two

Expiration Period Three

Key Software Enterprise

Maximum

Earliest Tax Year

Latest Tax Year

Maximum

Earliest Tax Year

Latest Tax Year

High And New Technology Enterprise

High And New Technology Enterprise

High And New Technology Enterprise

Income Taxes [Line Items]

Minimum paid-in capital required for a specified Japan national income tax rate

¥ 100,000,000

A specified Japan national income tax rate

30.00%

Unified statutory income tax rate under current EIT law

25.00%

25.00%

Preferential enterprise income tax rate, effective period

3 years

2 years

A preferential enterprise income tax rate

15.00%

10.00%

Tax holiday, expiration date

1-Jan-15

1-Jan-16

1-Jan-17

1-Jan-15

Statutory withholding tax rate to which dividends paid by a FIE to any of its foreign non-resident enterprise investors are subject

10.00%

10.00%

Special withholding tax rate to which dividends paid by a FIE to its foreign non-resident enterprise investors of certain jurisdictions are subject

5.00%

5.00%

Operating loss carry forwards

842,090,000

5,220,000,000

Beginning expiration date of net operating loss

1-Jan-17

1-Jan-15

Accrued withholding tax

95,789,000

594,336,000

580,720,000

Undistributed earnings no withholding tax has accrued

$7,970,000,000

49,440,000,000

Time period that tax authorities could conduct examinations of entity's tax filings

5 years

7 years

Tax years remain open to examination by respective taxing jurisdictions

2010

2014

2008

2014

Income_Before_Income_Taxes_Det

Income Before Income Taxes (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Income Loss From Continuing Operations Before Income Taxes Minority Interest By Jurisdiction [Abstract]
PRC	$2,866,128	17,783,174	13,815,469	12,537,331
Non-PRC	-533,254	-3,308,631	-1,630,453	-571,894
Income before income taxes	$2,332,874	14,474,543	12,185,016	11,965,437

Components_of_Income_Tax_Detai

Components of Income Tax (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Income Tax Disclosure [Abstract]
Current income tax	$474,192	2,942,173	2,006,980	1,888,378
Income tax refund due to reduced tax rate	-2,829	-17,553	-508,686	-255,189
Adjustments of deferred tax assets due to reduced tax rates	4,536	28,146	21,573	0
Deferred income tax (benefit) expense	-116,300	-721,594	309,063	-59,030
Taxation for the year	$359,599	2,231,172	1,828,930	1,574,159

Reconciliation_of_Effective_In

Reconciliation of Effective Income Tax Provision of Tax Computed By Applying Statutory Income Tax Rate to Pre-Tax Income (Detail)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Income Tax Disclosure [Abstract]
Expected taxation at PRC EIT statutory rate	$578,231	3,587,693	3,046,254	2,991,359
Effect of differing tax rates in different jurisdictions	109,058	676,663	312,938	138,931
Permanent differences - non-taxable income	-2,015	-12,504	-69,673	-58,157
Permanent differences - non-deductible expenses	19,864	123,245	168,735	58,201
Tax incentives relating to research and development expenditures	-86,759	-538,305	-318,652	-154,977
Effect of preferential tax rates inside the PRC	-305,771	-1,897,184	-2,152,806	-1,489,331
Effect of tax rate changes on deferred taxes	4,536	28,146	21,573	0
Over-accrued EIT for previous years	-24,679	-153,121	-32,982	-15,084
Withholding tax on PRC subsidiaries' undistributed earnings	0	0	560,243	0
Addition to valuation allowance	67,134	416,539	293,300	103,217
Taxation for the year	$359,599	2,231,172	1,828,930	1,574,159
Effective tax rate	15.41%	15.41%	15.01%	13.16%
Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share	$8.64	53.61	61.53	42.63

Tax_Effects_of_Temporary_Diffe

Tax Effects of Temporary Differences that Give Rise to Deferred Tax Balances (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY
Deferred tax assets, current:
Provision for doubtful receivables	$3,736	23,179	10,670
Net operating loss carry-forward	3,975	24,666	0
Accrued expenses, payroll and others	125,307	777,478	316,092
Less: valuation allowance	-22,624	-140,371	-39,918
Current deferred tax assets, net	110,394	684,952	286,844
Deferred tax assets, non-current:
Fixed assets depreciation	6,150	38,157	28,755
Net operating loss carry-forward	145,987	905,790	580,963
Advertising expenses and others	49,420	306,635	163,591
Less: valuation allowance	-159,793	-991,455	-675,369
Non-current deferred tax assets, net	41,764	259,127	97,940
Long-lived assets arising from acquisitions	88,561	549,485	619,550
Withholding tax on PRC subsidiaries' undistributed earnings	95,789	594,336	580,720
Deferred tax liabilities	$184,350	1,143,821	1,200,270

Employee_Defined_Combination_P

Employee Defined Combination Plan - Additional Information (Detail)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Total amounts incurred for employee defined contribution plan	$263.86	1,640	1,050	631.25

Commitment_and_Contingencies_A

Commitment and Contingencies - Additional Information (Detail)

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Network Infrastructure and Buildings

Network Infrastructure and Buildings

Office

Office

Office

Office

IDC Facilities

IDC Facilities

IDC Facilities

IDC Facilities

Obligations related to the entity's directors and officers

Obligations related to the entity's directors and officers

Obligations related to the entity's directors and officers

USD ($)

CNY

USD ($)

CNY

CNY

CNY

USD ($)

CNY

CNY

CNY

USD ($)

CNY

CNY

Commitments and Contingencies Disclosure [Line Items]

Capital commitments contracted not yet reflected in financial statements

$182,120,000

1,130,000,000

Total operating lease expense

84,660,000

525,310,000

284,580,000

196,590,000

459,340,000

2,850,000,000

1,940,000,000

1,070,000,000

Fair value of indemnification obligations related to the entity's directors and officers

$0

0

0

Future_Minimum_Payments_Under_

Future Minimum Payments Under Non-Cancelable Operating Leases with Initial Terms of One-Year or More (Detail)	Dec. 31, 2014	Dec. 31, 2014
In Thousands, unless otherwise specified	USD ($)	CNY
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$389,853	2,418,879
2016	186,983	1,160,152
2017	120,593	748,230
2018	95,591	593,102
2019	46,913	291,077
Thereafter	27,400	170,008
Operating Leases, Future Minimum Payments Due, Total	$867,333	5,381,448

Future_Minimum_Payments_Under_1

Future Minimum Payments Under Non-Cancelable Licensing Agreements (Detail) (Licensed copyrights of video contents)	Dec. 31, 2014	Dec. 31, 2014
In Thousands, unless otherwise specified	USD ($)	CNY
Commitment And Contingencies [Line Items]
2015	$347,269	2,154,666
2016 and thereafter	0	0
Future Minimum Payments Under Non-Cancelable Licensing agreements	$347,269	2,154,666

Summary_of_Redeemable_Noncontr

Summary of Redeemable Noncontrolling Interest (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
	USD ($)		CNY		CNY	CNY
Temporary Equity Disclosure [Abstract]
Balance as of January 1	$0		0		1,033,283	935,978
Business combination	0		0		0	100,101
Net losses	0		0		-61,857	-55,804
Other comprehensive losses	0		0		-55,420	-690
Exercise of share-based awards	0		0		464	0
Share-based compensation	0		0		11,259	5,566
Issuance of subsidiary shares	296,845	[1]	1,841,819	[1]	51,368	25,989
Accretion of redeemable noncontrolling interests	8,493	[1]	52,683	[1]	31,799	22,143
Acquisition of subsidiaries' redeemable shares from noncontrolling shareholders	0		0		-121,962	0
Reclassification of redeemable noncontrolling interests	0		0		-888,934	0
Balance as of December 31	$305,338		1,894,502		0	1,033,283
[1]	On November 14, 2014, Qiyi completed a round of preferred shares financing. The new preferred shareholders acquired 13.42% of the then outstanding equity interest of Qiyi for a total consideration of US$300 million. The newly issued preferred shares could be redeemed by such shareholders upon the occurrence of certain events that are not solely within the control of Qiyi and are accounted for as redeemable noncontrolling interests. The Company accounts for the accrete changes in the redemption value in accordance with ASC topic 480 ("ASC 480"), Distinguishing Liabilities from Equity. The Company elects to use the effective interest method for the changes of redemption value over the period from the date of issuance to the earliest redemption date of the noncontrolling interest.

Summary_of_Redeemable_Noncontr1

Summary of Redeemable Noncontrolling Interest (Parenthetical) (Detail) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Nov. 14, 2014
Temporary Equity Disclosure [Abstract]
Acquired percentage of the outstanding equity interest	13.42%
Total purchase consideration	$300

Shareholders_Equity_Additional

Shareholder's Equity - Additional Information (Detail)	12 Months Ended						12 Months Ended		12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
	USD ($)	CNY	USD ($)	CNY		Preferred Stock	Class A Ordinary Shares	Class A Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares
						USD ($)	USD ($)		USD ($)
Stockholders Equity Note [Line Items]
Common stock, shares authorized	870,400,000	870,400,000				10,000,000	825,000,000	825,000,000	35,400,000	35,400,000
Par value per share (US$)	$0.00		$0.00			$0.00	$0.00		$0.00
Number of votes per share							1		10
Transfer of Class B ordinary shares to Class A Ordinary shares	45,000	45,000	225,079	225,079	40,000
Common stock, shares outstanding							27,613,315	27,492,452	7,492,921	7,537,921
Allocation of after-tax profits to general reserve fund, percentage	10.00%	10.00%
Limit of general reserve fund as a percentage of registered capital, after which allocations to general reserve fund are no longer required	50.00%	50.00%
Allocation of after-tax profits to statutory surplus fund, percentage	10.00%	10.00%
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required	50.00%	50.00%
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs	$1.22	7.54		3.72

Shareholders_Equity_Detail

Shareholders' Equity (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	USD ($)	CNY	CNY
Cumulative Effect on Retained Earnings, Net of Tax [Abstract]
PRC statutory reserve funds	$60,470	375,193	321,206
Unreserved retained earnings	7,620,891	47,284,579	34,204,180
Total retained earnings	$7,681,361	47,659,772	34,525,386

Components_of_Accumulated_Othe

Components of Accumulated Other Comprehensive Income (Loss) (Detail)	12 Months Ended							12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
	USD ($)	CNY	CNY	CNY	Foreign currency translation adjustment	Foreign currency translation adjustment	Foreign currency translation adjustment	Unrealized gains on available- for-sale investments	Unrealized gains on available- for-sale investments	Unrealized gains on available- for-sale investments
					CNY	CNY	USD ($)	CNY	CNY	USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		843,096	-78,278		163,288	-89,714	($48,766)	679,808	11,436	$86,145
Other comprehensive income (loss) before reclassification		-545,995	920,826		-445,710	190,322		-100,285	730,504
Amounts reclassified from accumulated other comprehensive income		-45,025	-62,132		0	0		-45,025	-62,132
Other comprehensive income (loss), net of tax	-95,255	-591,020	858,694	5,291	-445,710	190,322		-145,310	668,372
Other comprehensive income (loss) attribute to noncontrolling interests		-20,153	62,680		-20,153	62,680		0	0
Ending balance	$37,379	231,923	843,096	-78,278	-302,575	163,288	($48,766)	534,498	679,808	$86,145

Tax_Effect_Allocated_to_Each_C

Tax Effect Allocated to Each Component of Other Comprehensive Income (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
	USD ($)	CNY	CNY
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized holding gains during the year	$271	1,680	-1,157
Reclassified for gains realized	0	0	0
Net unrealized gains	271	1,680	-1,157
Foreign currency translation adjustment	0	0	0
Other comprehensive income (loss)	$271	1,680	-1,157

Reconciliation_of_Net_Income_t

Reconciliation of Net Income to Numerator for Computation of Basic and Diluted Net Income per Share (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Net income attributable to Baidu, Inc.	$2,125,372	13,187,069	10,518,966	10,456,028
Accretion of the redeemable noncontrolling interests	-8,493	-52,683	-31,799	-22,143
Numerator for EPS computation	$2,116,879	13,134,386	10,487,167	10,433,885

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Net Income Attributable to Baidu, Inc. Per Share for Class A and Class B Ordinary Shares (Detail)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	USD ($)	CNY	CNY	CNY	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class A Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares	Class B Ordinary Shares
					USD ($)	CNY	CNY	CNY	American Depositary Shares	American Depositary Shares	American Depositary Shares	American Depositary Shares	USD ($)	CNY	CNY	CNY
									USD ($)	CNY	CNY	CNY
Earnings per ADS:
Denominator used for earnings per ADS - basic					27,551,463	27,551,463	27,274,769	27,145,208	275,514,630	275,514,630	272,747,690	271,452,080	7,511,003	7,511,003	7,711,459	7,794,630
Denominator used for earnings per ADS - diluted					35,198,474	35,198,474	35,036,346	34,979,459	351,984,740	351,984,740	350,363,460	349,794,590	7,511,003	7,511,003	7,711,459	7,794,630
Earnings per ADS - basic					$60.37	374.6	299.75	298.62	$6.04	37.46	29.98	29.86	$60.37	374.6	299.75	298.62
Earnings per ADS - diluted					$60.14	373.15	299.32	298.29	$6.01	37.32	29.93	29.83	$60.14	373.15	299.32	298.29
Numerator
Allocation of net income attributable to Baidu, Inc.	$2,116,879	13,134,386	10,487,167	10,433,885	$1,663,406	10,320,767	8,175,647	8,106,219					$453,473	2,813,619	2,311,520	2,327,666
Denominator
Weighted average ordinary shares outstanding					27,551,463	27,551,463	27,274,769	27,145,208	275,514,630	275,514,630	272,747,690	271,452,080	7,511,003	7,511,003	7,711,459	7,794,630
Denominator used for earnings per share					27,551,463	27,551,463	27,274,769	27,145,208	275,514,630	275,514,630	272,747,690	271,452,080	7,511,003	7,511,003	7,711,459	7,794,630
Earnings per share - basic					$60.37	374.6	299.75	298.62	$6.04	37.46	29.98	29.86	$60.37	374.6	299.75	298.62
Numerator
Allocation of net income attributable to Baidu, Inc. for diluted computation					1,665,158	10,331,639	8,178,954	8,108,856					451,721	2,802,747	2,308,213	2,325,029
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares					451,721	2,802,747	2,308,213	2,325,029
Allocation of net income attributable to Baidu, Inc.					$2,116,879	13,134,386	10,487,167	10,433,885					$451,721	2,802,747	2,308,213	2,325,029
Denominator
Weighted average ordinary shares outstanding					27,551,463	27,551,463	27,274,769	27,145,208	275,514,630	275,514,630	272,747,690	271,452,080	7,511,003	7,511,003	7,711,459	7,794,630
Conversion of Class B to Class A ordinary shares					7,511,003	7,511,003	7,711,459	7,794,630
Share-based awards					136,008	136,008	50,118	39,621
Denominator used for earnings per share					35,198,474	35,198,474	35,036,346	34,979,459	351,984,740	351,984,740	350,363,460	349,794,590	7,511,003	7,511,003	7,711,459	7,794,630
Earnings per share - diluted					$60.14	373.15	299.32	298.29	$6.01	37.32	29.93	29.83	$60.14	373.15	299.32	298.29

Share_Based_Award_Plan_Additio

Share Based Award Plan - Additional Information of Baidu, Inc. (Detail)

12 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Stock Options

Stock Options

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

Parent Company

2008 Plan

2008 Plan

USD ($)

2008 Plan

Stock Options

Stock Options

Stock Options

Stock Options

Stock Options

Stock Options

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Employee Holding No More Than Ten Percent Voting Power

Employee Holding More Than Ten Percent Voting Power

Employee Holding More Than Ten Percent Voting Power

Maximum

Minimum

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

Maximum

Minimum

Maximum

Maximum

Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares authorized for issuance

3,428,777

Contractual term of share-based awards granted

10 years

5 years

Percentage of voting power

10.00%

Shares vesting term

4 years

2 years

4 years

2 years

Percentage of the fair market value of the entity's ordinary shares

110.00%

Total intrinsic value of options exercised

$36.23

224.8

114.21

200.91

Total fair value of options vested

24.05

149.22

123.44

53.56

Unrecognized share-based compensation cost

44.07

273.44

217.84

1,350

A weighted-average vesting period over which the deferred cost is expected to be recognized

2 years 4 months 6 days

2 years 4 months 6 days

3 years 7 days

3 years 7 days

The weighted-average grant-date fair value of options granted during respective years

$755

$419.80

$323

Total fair value of shares vested during respective years, restricted shares

$52.28

324.41

247.24

128.7

The weighted-average grant-date fair value of restricted shares granted during respective years

$1,815.60

$1,815.60

$1,137

$1,152.10

Option_Activity_Baidu_Inc_Deta

Option Activity - Baidu, Inc. (Detail) (Parent Company, USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Parent Company
Share Option Roll Forward - Number of shares
Outstanding, December 31, 2013	232,572
Granted	19,477
Exercised	-30,819
Forfeited/Cancelled	-22,838
Outstanding, December 31, 2014	198,392	232,572
Vested and expected to vest at December 31, 2014	171,597
Exercisable at December 31, 2014	66,993
Share Option Roll Forward - Weighted-Average Exercise Price
Outstanding, December 31, 2013	$1,042.90
Granted	$1,916.10
Exercised	$942.10
Forfeited/Cancelled	$1,071.40
Outstanding, December 31, 2014	$1,141	$1,042.90
Vested and expected to vest at December 31, 2014	$1,139.30
Exercisable at December 31, 2014	$1,003.30
Share Option Roll Forward - Weighted-Average Remaining Contractual Life (in years)
Outstanding	7 years 9 months 29 days	8 years 7 months 13 days
Vested and expected to vest at December 31, 2014	7 years 9 months 18 days
Exercisable at December 31, 2014	7 years 1 month 21 days
Share Option Roll Forward - Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2013	$171,156
Outstanding, December 31, 2014	225,915	171,156
Vested and expected to vest at December 31, 2014	195,684
Exercisable at December 31, 2014	$85,509

Assumptions_Used_to_Estimate_F

Assumptions Used to Estimate Fair Values of Share Options Granted - Baidu, Inc. (Detail) (Parent Company)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]
Risk-free interest rate, minimum	1.52%	0.40%	0.35%
Risk-free interest rate, maximum	1.77%	1.35%	0.43%
Dividend yield	0.00%	0.00%	0.00%
Expected volatility range, minimum	40.96%	42.33%	43.60%
Expected volatility range, maximum	41.59%	44.17%	44.72%
Weighted average expected volatility	41.36%	43.33%	43.75%
Expected life	4 years 6 months 26 days
Minimum
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]
Expected life		3 years 29 days	2 years 8 months 1 day
Maximum
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]
Expected life		4 years 6 months 26 days	3 years 29 days

Restricted_Shares_Activity_Det

Restricted Shares Activity (Detail) (Parent Company, USD $)	12 Months Ended
	Dec. 31, 2014
Parent Company
Restricted Shares Roll Forward - Number of Shares
Unvested, December 31, 2013	146,510
Granted	152,852
Vested	-45,161
Forfeited	-34,797
Unvested, December 31, 2014	219,404
Restricted Shares Roll Forward - Weighted Average Grant Date Fair Value
Unvested, December 31, 2013	$1,151.40
Granted	$1,815.60
Vested	$1,157.70
Forfeited	$1,346.10
Unvested, December 31, 2014	$1,582.60

Share_Based_Award_Plan_Additio1

Share Based Award Plan - Additional Information of Subsidiaries- Qunar Cayman Islands Limited (Detail) (Qunar)

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Sep. 22, 2013

Aug. 10, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Sep. 22, 2013

Sep. 22, 2013

Jan. 13, 2013

Nov. 25, 2014

Jan. 13, 2013

USD ($)

CNY

CNY

CNY

Stock Options

Stock Options

Stock Options

Stock Options

2007 Plan

2007 Plan

2007 Plan

2007 Plan

2007 Plan

2007 Plan

2007 Plan

2007 Plan

2007 Plan

2007 Plan

Business Unit Incentive Plan

Business Unit Incentive Plan

Business Unit Incentive Plan

USD ($)

CNY

CNY

CNY

Stock Options Subject To Performance Condition

Stock Options Subject To Performance Condition

Stock Options Subject To Performance Condition

Awards Vesting 1 Year after Grant Date

Remaining Grants Vest on Quarterly Basis Thereafter

Stock Options

Stock Options

Stock Options

USD ($)

Class B Ordinary Shares

Class B Ordinary Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares authorized for issuance

26,060,000

18,000,000

10,800,000

Shares available for issuance annual increase, percentage

1.50%

Additional shares authorized for issuance

6,066,896

Contractual term of share-based awards granted

10 years

Shares vesting term

4 years

3 months

Options vesting percentage

25.00%

6.25%

Number of shares granted

9,993,411

9,993,411

9,993,411

10,988,106

4,765,068

7,929,555

1,671,867

0

Options granted, exercise price

$0.01

$0.01

Total intrinsic value of options exercised

$82,020,000

508,520,000

88,920,000

31,110,000

Total fair value of options vested

35,610,000

220,800,000

88,870,000

23,780,000

Unrecognized share-based compensation costs

72,280,000

448,160,000

A weighted-average vesting period over which the deferred cost is expected to be recognized

2 years 8 months 16 days

2 years 8 months 16 days

Weighted-average grant-date fair value

$9.45

58.59

16.59

12.54

Share-based compensation cost

$42,930,000

266,370,000

63,710,000

27,210,000

Option_Activity_Detail

Option Activity (Detail) (Qunar, USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Qunar
Share Option Roll Forward - Number of shares
Outstanding, December 31, 2013	25,192,696
Granted	9,993,411
Exercised	-8,907,408
Forfeited/Cancelled	-1,115,256
Outstanding, December 31, 2014	25,163,443	25,192,696
Vested and expected to vest at December 31, 2014	21,880,749
Exercisable at December 31, 2014	9,685,685
Share Option Roll Forward - Weighted-Average Exercise Price
Outstanding, December 31, 2013	$1.40
Granted	$0.01
Exercised	$0.27
Forfeited/Cancelled	$0.02
Outstanding, December 31, 2014	$1.30	$1.40
Vested and expected to vest at December 31, 2014	$1.43
Exercisable at December 31, 2014	$1.72
Share Option Roll Forward - Weighted-Average Remaining Contractual Life (in years)
Outstanding, December 31, 2013	7 years 10 months 21 days	7 years 4 months 21 days
Vested and expected to vest at December 31, 2014	7 years 9 months
Exercisable at December 31, 2014	6 years 7 months 13 days
Share Option Roll Forward - Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2013	$184,355
Outstanding, December 31, 2014	201,417	184,355
Vested and expected to vest at December 31, 2014	176,072
Exercisable at December 31, 2014	$75,118

Assumptions_Used_to_Estimate_F1

Assumptions Used to Estimate Fair Values of Share Options Granted (Detail) (Qunar)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Qunar
Share based Compensation Arrangement Assumptions Used to Estimate Fair Values of Share Options Granted [Line Items]
Risk-free interest rate, minimum	1.91%	1.91%	1.70%
Risk-free interest rate, maximum	2.07%	2.71%	2.28%
Dividend yield	0.00%	0.00%	0.00%
Expected volatility range, minimum	45.78%	46.68%	48.03%
Expected volatility range, maximum	46.58%	47.66%	49.84%
Expected life	6 years 1 month 10 days	10 years	10 years

Total_ShareBased_Compensation_

Total Share-Based Compensation Cost Recognized (Detail)

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

USD ($)

CNY

CNY

CNY

Cost of Sales

Cost of Sales

Cost of Sales

Cost of Sales

Selling, General and Administrative Expense

Selling, General and Administrative Expense

Selling, General and Administrative Expense

Selling, General and Administrative Expense

Research and Development Expense

Research and Development Expense

Research and Development Expense

Research and Development Expense

USD ($)

CNY

CNY

CNY

USD ($)

CNY

CNY

CNY

USD ($)

CNY

CNY

CNY

Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]

Share-based compensation

$5,578

34,611

23,976

10,105

$68,667

426,052

164,704

54,512

$80,921

502,077

326,047

147,692

Capitalized as part of internal-used software

$0

0

229

1,944

Segment_Reporting_Additional_I

Segment Reporting - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
	Segment
Segment Reporting [Abstract]
Number of operating segment	1

Revenues_by_Geographic_Area_De

Revenues by Geographic Area (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	PRC	PRC	PRC	PRC	Non-PRC	Non-PRC	Non-PRC	Non-PRC
	USD ($)	CNY	CNY	CNY	USD ($)	CNY	CNY	CNY
Revenues:
Revenues	$7,864,149	48,793,898	31,875,202	22,198,685	$41,650	258,420	68,722	107,341

Longlived_Assets_by_Geographic

Long-lived Assets by Geographic Area (Detail)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	PRC	PRC	PRC	Non-PRC	Non-PRC	Non-PRC
	USD ($)	CNY	CNY	USD ($)	CNY	CNY
Long-lived assets:
Long-lived assets	$1,525,716	9,466,458	5,355,157	$13,691	84,949	56,143

Fair_Value_Disclosure_and_Meas

Fair Value Disclosure and Measurement (Detail)

12 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

USD ($)

CNY

CNY

CNY

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Other Long-term Investments

Other Long-term Investments

Other Long-term Investments

Other Long-term Investments

Other Long-term Investments

Other Long-term Investments

Time Deposits

Time Deposits

Time Deposits

Money Market Fund

Money Market Fund

Money Market Fund

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Measurements, Nonrecurring

Fair Value, Measurements, Nonrecurring

Fair Value, Measurements, Nonrecurring

Fair Value, Measurements, Nonrecurring

Fair Value, Measurements, Nonrecurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fixed-rate Investments

Fixed-rate Investments

Fixed-rate Investments

Adjustable-rate Debt Investments

Adjustable-rate Debt Investments

Adjustable-rate Debt Investments

Equity Investments

Equity Investments

Equity Investments

Fixed-rate Investments

Fixed-rate Investments

Equity Investments

Equity Investments

Debt Investment

Debt Investment

USD ($)

CNY

CNY

USD ($)

CNY

CNY

CNY

CNY

Money Market Fund

Money Market Fund

CNY

CNY

Short-term Investments

Short-term Investments

Short-term Investments

Other Long-term Investments

Time Deposits

Time Deposits

CNY

CNY

USD ($)

CNY

CNY

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Other Long-term Investments

Other Long-term Investments

Other Long-term Investments

Other Long-term Investments

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 3

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

USD ($)

CNY

USD ($)

CNY

CNY

CNY

Fixed-rate Investments

Fixed-rate Investments

Adjustable-rate Debt Investments

Fixed-rate Investments

CNY

CNY

CNY

CNY

Fixed-rate Investments

Fixed-rate Investments

Fixed-rate Investments

Adjustable-rate Debt Investments

Adjustable-rate Debt Investments

Adjustable-rate Debt Investments

Equity Investments

Equity Investments

Equity Investments

Equity Investments

Equity Investments

Debt Investment

Debt Investment

Short-term Investments

Short-term Investments

Other Long-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Short-term Investments

Other Long-term Investments

CNY

CNY

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

CNY

USD ($)

CNY

USD ($)

CNY

Equity Investments

Equity Investments

Equity Investments

Fixed-rate Investments

Fixed-rate Investments

Adjustable-rate Debt Investments

Adjustable-rate Debt Investments

Debt Investment

CNY

CNY

CNY

CNY

CNY

CNY

CNY

CNY

Fair value disclosure

Cash equivalents

$281,547

1,746,888

2,955,924

$121,699

755,095

689,254

755,095

689,254

1,746,888

2,955,924

Held-to-maturity investments

6,164,575

38,248,723

19,370,067

9,593

59,519

85,633

531,318

38,248,723

19,370,067

59,519

531,318

Long-term notes payable

3,515,403

21,811,666

14,797,937

21,811,666

14,797,937

Fair value measurement

Available-for-sale investments, current

461,770

2,865,096

7,627,958

252,803

1,568,543

514,433

187,718

1,164,714

1,253,120

18,683

115,921

43,948

272,680

461,770

2,865,096

7,627,958

252,803

1,568,543

514,433

187,718

1,164,714

1,253,120

1,164,714

1,253,120

2,865,096

7,627,958

1,568,543

514,433

Available-for-sale investments, noncurrent

18,683

115,921

43,948

272,680

115,921

272,680

Long-term investments

0

0

0

0

0

Fixed assets

0

0

Intangible assets

0

0

0

0

0

Total assets measured at fair value

964,922

5,986,954

9,395,511

1,280,635

1,253,120

4,433,639

8,142,391

272,680

0

Long-term investments, losses

-15,060

-93,420

-17,520

-169,180

-15,057

-93,424

-17,521

Fixed assets, losses

-2,057

Intangible assets, losses

-260

-1,630

-4,620

0

-262

-1,625

-4,619

Total losses

($15,319)

-95,049

-24,197

-169,180

($15,319)

-95,049

-24,197

Reconciliation_of_AvailableFor

Reconciliation of Available-For-Sale Debt Investments at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Detail) (Fair Value, Inputs, Level 3, Available For Sale Debt Securities, Fair Value, Measurements, Recurring)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	CNY
Schedule of Available-for-sale Securities [Line Items]
Balance as of January 1, 2014	$0	0
Recognized during the period	43,948	272,680
Realized or unrealized gain (loss)	0	0
Settlement	0	0
Balance as of December 31, 2014	$43,948	272,680