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Changes In Equity And Redeemable Noncontrolling Interests (Tables) | 9 Months Ended
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Sep. 30, 2012
Changes in Equity and Redeemable Noncontrolling Interests |
|  | Attributable to Baidu, Inc. |  |  | Non- controlling interests |  |  | Total equity |  |  | Redeemable non-controlling interests |
|  | Ordinary shares |  |  | Additional paid-in capital |  |  | Retained earnings |  |  | Accumulated other comprehensive loss |  |  |  |
|  | Number of shares |  |  | Amount |  |  |  |  |  |  |
|  |  |  |  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Balance at December 31, 2011 |  |  | 34,914,117 |  |  |  | 15 |  |  |  | 1,771,770 |  |  |  | 13,604,334 |  |  |  | (84,403 | ) |  |  | 97,819 |  |  |  | 15,389,535 |  |  |  | 935,978 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,660,546 |  |  |  | — |  |  |  | (6,826 | ) |  |  | 7,653,720 |  |  |  | (45,961 | )
Other comprehensive income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,523 |  |  |  | (119 | ) |  |  | 9,404 |  |  |  | (378 | )
Noncontrolling interests in an acquired subsidiary |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,259 | ) |  |  | (1,259 | ) |  |  | — |
Acquisition of a subsidiary’s shares from noncontrolling interests |  |  | — |  |  |  | — |  |  |  | (1,499 | ) |  |  | — |  |  |  | — |  |  |  | 478 |  |  |  | (1,021 | ) |  |  | — |
Issuance of subsidiary shares |  |  | — |  |  |  | — |  |  |  | 74,471 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 74,471 |  |  |  | 25,989 |
Disposal of a subsidiary |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,253 |  |  |  | 5,253 |  |  |  | — |
Accretion of redeemable noncontrolling interests |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (22,143 | ) |  |  | — |  |  |  | — |  |  |  | (22,143 | ) |  |  | 22,143 |
Exercise of share-based awards |  |  | 44,820 |  |  |  | — |  |  |  | 47,327 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 47,327 |  |  |  | — |
Share-based compensation |  |  | — |  |  |  | — |  |  |  | 121,988 |  |  |  | — |  |  |  | — |  |  |  | 1,070 |  |  |  | 123,058 |  |  |  | 7,295 |
Balance at September 30, 2012 |  |  | 34,958,937 |  |  |  | 15 |  |  |  | 2,014,057 |  |  |  | 21,242,737 |  |  |  | (74,880 | ) |  |  | 96,416 |  |  |  | 23,278,345 |  |  |  | 945,066 |
Balance at September 30, 2012, in US$ |  |  |  |  |  |  | 2 |  |  |  | 320,465 |  |  |  | 3,380,018 |  |  |  | (11,914 | ) |  |  | 15,341 |  |  |  | 3,703,912 |  |  |  | 150,373 |

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- Definition Tabular disclosure for changes in equity and redeemable noncontrolling interests. + References No definition available. + Details
Name: | bidu_ScheduleOfStockholdersEquityAndRedeemableNoncontrollingInterestsTableTextBlock
Namespace Prefix: | bidu_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration