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Financial Instruments (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2020
USD ($)
Fair Value Measurements      
Time deposits-short term ¥ 71,079,327 ¥ 53,487,075 $ 10,893,383
Time deposits-long term 6,630,000 2,360,000 1,016,092
Equity investments with readily determinable fair values 3,743,590 3,551,545  
Short-term investments 13,273,026 15,312,595 $ 2,034,180
Total 94,725,943 74,711,215  
Quoted Prices in Active Market for Identical Assets (Level 1)      
Fair Value Measurements      
Time deposits-short term 71,079,327 53,487,075  
Time deposits-long term 6,630,000 2,360,000  
Equity investments with readily determinable fair values 3,743,590 3,551,545  
Total 81,452,917 59,398,620  
Significant Other Observable Inputs (Level 2)      
Fair Value Measurements      
Short-term investments 13,273,026 15,312,595  
Total 13,273,026 15,312,595  
Significant Unobservable Inputs (Level 3) | Certain of equity investments      
Fair Value Measurements      
Impairment charges of certain equity investments without determinable fair value ¥ 55,600 ¥ 168,400