Changes in the Carrying Amount of Goodwill (Detail) ¥ in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2021
CNY (¥)
|
Dec. 31, 2021
USD ($)
|
Dec. 31, 2020
CNY (¥)
|
|
| Goodwill [Line Items] | |||
| Beginning Balance | ¥ 22,248 | ¥ 18,250 | |
| Goodwill acquired | 357 | 3,998 | |
| Goodwill reassigned | 0 | ||
| Ending Balance | 22,605 | $ 3,547 | 22,248 |
| iQIYI | |||
| Goodwill [Line Items] | |||
| Beginning Balance | 3,888 | 3,888 | |
| Goodwill acquired | 0 | 0 | |
| Goodwill reassigned | 0 | ||
| Ending Balance | 3,888 | 610 | 3,888 |
| Baidu Core excluding SLG [Member] | |||
| Goodwill [Line Items] | |||
| Beginning Balance | 18,360 | 14,362 | |
| Goodwill acquired | 357 | 3,998 | |
| Goodwill reassigned | (1,777) | ||
| Ending Balance | 16,940 | 2,658 | 18,360 |
| SLG | |||
| Goodwill [Line Items] | |||
| Beginning Balance | 0 | 0 | |
| Goodwill acquired | 0 | 0 | |
| Goodwill reassigned | 1,777 | ||
| Ending Balance | ¥ 1,777 | $ 279 | ¥ 0 |