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Fair Value Measurements - Summary of Assets Measured at Fair Value on a Non-Recurring Basis (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Nonrecurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term investments ¥ (9,989) $ (1,435) ¥ (622) $ (89)    
Long Term Investments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term investments 22,778   19,739   $ 3,272 $ 2,835
Long-term investments (230) (33) 3,512 504    
Intangible Assets            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Intangible assets 76   0   $ 11 $ 0
Intangible assets (406) $ (58) (5) $ (1)    
Fair Value, Inputs, Level 1 | Long Term Investments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term investments 14,105   0      
Fair Value, Inputs, Level 1 | Intangible Assets            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Intangible assets 0   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 358   4,983      
Fair Value, Inputs, Level 2 | Intangible Assets            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Intangible assets 0   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 8,315   14,756      
Fair Value, Inputs, Level 3 | Intangible Assets            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Intangible assets ¥ 76   ¥ 0