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Fair Value Measurements - Summary of Assets Measured at Fair Value on a Non-Recurring Basis (Detail)
¥ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
CNY (¥)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Jun. 30, 2020
USD ($)
Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term investment impairment ¥ (2,460) $ (348) ¥ (9,989)  
Long Term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term investments fair value 10,120   22,778 $ 1,432
Long-term investments fair value adjustment 1,302 184 (230)  
Intangible Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible asset fair value 62   76 $ 9
Intangible asset impairment     (406)  
Intangible Assets | Fair Value, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible asset impairment (335) $ (47)    
Fair Value, Inputs, Level 1 | Long Term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term investments fair value 0   14,105  
Fair Value, Inputs, Level 1 | Intangible Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible asset fair value 0      
Fair Value, Inputs, Level 2 | Long Term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term investments fair value 0   358  
Fair Value, Inputs, Level 2 | Intangible Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible asset fair value 0      
Fair Value, Inputs, Level 3 | Long Term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term investments fair value 10,120   8,315  
Fair Value, Inputs, Level 3 | Intangible Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible asset fair value ¥ 62   ¥ 76