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Share-based Payment - Additional Information (Detail)
¥ / ADR in Millions, ¥ in Millions
12 Months Ended
Sep. 04, 2019
shares
Aug. 31, 2015
shares
Dec. 31, 2014
shares
Dec. 31, 2021
CNY (¥)
shares
¥ / ADR
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
Jul. 21, 2021
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Share based payments number of shares granted 15,000,000,000     8      
Valid term of share option plans       10      
Share option plans vesting term       4 years      
Weighted average remaining contract life for outstanding share options       4 years 5 months 19 days 5 years 6 months 7 days    
Number of share options granted in share-based payment arrangement       0 0    
Share based payment transactions expenses with share option | ¥       ¥ 4 ¥ 95 ¥ 55  
Stock repurchase program, Number of shares repurchased       107,000,000 54,000,000    
Phase I Share Incentive Plan [Member] | Top of range [member] | ClassA ordinary shares [Member]              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Share based payments number of shares granted     20,644,803        
Phase II Share Incentive Plan [Member] | Top of range [member] | ClassA ordinary shares [Member]              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Share based payments number of shares granted   25,000,000          
Two Thousand Ninteen Performance Share Unit Plan [Member]              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of share options granted in share-based payment arrangement       1,589,900 1,990,600    
Share Based Payment Arrangement Options Granted Percentage Variation       zero to 100      
Performance Share Units              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of share options granted in share-based payment arrangement       1,590,000 1,990,000    
Description of vesting requirements for share-based payment arrangement       four-year      
2014 Plan | Tun Kung Company Limited              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Stock repurchase program, Number of shares repurchased             35,644,803,000
2015 Plan | Tun Kung Company Limited              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Stock repurchase program, Number of shares repurchased             35,644,803,000
2019 Plan | Tun Kung Company Limited              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Stock repurchase program, Number of shares repurchased             35,644,803,000