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Investments | 9 Months Ended
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Sep. 30, 2012
Investments | 3. INVESTMENTS Long-term investments The Company’s carrying amount of cost method investments was RMB389,630 and RMB414,367 (US$65,932) as of December 31, 2011 and September 30, 2012, respectively. The Company’s carrying amount of equity method investments was RMB344,730 and RMB173,716 (US$27,641) as of December 31, 2011 and September 30, 2012, respectively. The Company’s carrying amount of long-term held-to-maturity investments was nil and RMB505,473 (US$80,427) as of December 31, 2011 and September 30, 2012, respectively. Short-term investments As of December 31, 2011 and September 30, 2012, short-term investments included (i) fixed-rate and adjustable-rate products in commercial banks in the amount of RMB9,948,896 and RMB15,374,961 (US$2,446,372), respectively, and (ii) available-for-sale debt securities with fixed-rate and adjustable rates in the amount of RMB102,682 and RMB3,338,196 (US$531,154 ), respectively. During the nine-month periods ended September 30, 2011 and 2012, the Company recorded short-term investment gains of RMB49,383 and RMB504,566 (US$80,284) in earnings, respectively. No gross realized gain or loss from the sales of available-for-sale securities was recorded in each of the nine-month periods. Investments classified as held-to-maturity securities and available-for-sale securities as of December 31, 2011 and September 30, 2012 were as follows:
|  | As of December 31, 2011 |
|  | Amortized cost |  |  | Gross unrecognized holding gains |  |  | Gross unrecognized holding losses |  |  | Gross unrealized gains |  |  | Fair value |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate investments |  |  | 9,848,848 |  |  |  | 10,504 |  |  |  | (25,077 | ) |  |  |  |  | — |  |  |  | 9,834,275 |
Adjustable-rate investments |  |  | 100,048 |  |  |  | — |  |  |  | (21 | ) |  |  |  |  | — |  |  |  | 100,027 |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustable-rate investments |  |  | 102,637 |  |  |  | — |  |  |  | — |  |  |  |  |  | 45 |  |  |  | 102,682 |
|  | As of September 30, 2012 |
|  | Amortized cost |  |  | Gross unrecognized holding gains |  |  | Gross unrecognized holding losses |  |  | Gross unrealized gains |  |  | Fair value |  |  | Fair value |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate investments |  |  | 14,504,574 |  |  |  | 40,809 |  |  |  | (26,290 | ) |  |  | — |  |  |  | 14,519,093 |  |  |  | 2,310,192 |
Adjustable-rate investments |  |  | 870,387 |  |  |  | 1,485 |  |  |  | — |  |  |  | — |  |  |  | 871,872 |  |  |  | 138,727 |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate investments |  |  | 250,040 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 250,040 |  |  |  | 39,785 |
Adjustable-rate investments |  |  | 3,076,361 |  |  |  | — |  |  |  | — |  |  |  | 11,795 |  |  |  | 3,088,156 |  |  |  | 491,369 |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate held-to-maturity investments |  |  | 505,473 |  |  |  | 1,457 |  |  |  | — |  |  |  | — |  |  |  | 506,930 |  |  |  | 80,660 |
Held-to-maturity securities are stated at amortized cost. The fair values of held-to-maturity securities and available-for-sale securities are determined based on a discounted cash flow model using the discount curve of market interest rates. The long-term held-to-maturity investments mature in May 2014 and August 2014 in accordance with their contract terms.

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- Definition This item represents the disclosure related to cost method investments, equity method investments and investments in held-to-maturity securities, trading securities and available-for-sale securities. + References No definition available. + Details
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Namespace Prefix: | bidu_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration