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Lines of credit and loan facilities (Details 2)
¥ in Millions, $ in Millions, $ in Millions, ₨ in Billions
1 Months Ended 12 Months Ended
Feb. 01, 2022
HKD ($)
Apr. 30, 2020
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2021
CNY (¥)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
INR (₨)
Dec. 31, 2021
HKD ($)
Lines of credit and loan facilities                  
Percentage over variable rate basis           1.15%      
Debt payable within one year | ¥         ¥ 0        
Interest rate         2.80%   2.80% 2.80% 2.80%
Oneyear corporate bond                  
Lines of credit and loan facilities                  
short-term debts | ₨               ₨ 1.5  
Term and Revolving Credit Facilities                  
Lines of credit and loan facilities                  
Term (in years)       5 years 5 years 5 years 5 years 5 years 5 years
Maximum borrowing capacity under facilities       $ 1,000   $ 1,000 $ 2,000    
Number of arrangers | item       24 5        
Undrawn balance which will be expired one month prior to the final maturity date             550   $ 15,931
Proceeds from long-term borrowings   $ 550 $ 450            
Debt payable within one year             $ 450    
Term and Revolving Credit Facilities | Subsequent Event [Member]                  
Lines of credit and loan facilities                  
Proceeds from long-term borrowings $ 6,300                
Term loan facility agreement                  
Lines of credit and loan facilities                  
Undrawn balance which will be expired one month prior to the final maturity date                 $ 15,931
Term loan facility agreement | Hong Kong Interbank Offered Rate | Date falling 6 months from the initial utilization date                  
Lines of credit and loan facilities                  
Percentage over variable rate basis         0.70%        
Term loan facility agreement | Hong Kong Interbank Offered Rate | Initial Utilization date                  
Lines of credit and loan facilities                  
Percentage over variable rate basis         0.50%