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Unsecured senior notes (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2016
CNY (¥)
item
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2020
CNY (¥)
Jan. 31, 2020
USD ($)
Apr. 30, 2016
USD ($)
Unsecured senior notes                  
Interest rate (as a percent)   2.80%     2.80%        
Carrying value   ¥ 9,386   ¥ 9,594 $ 1,473        
Future principal payments for unsecured senior notes due                  
Due in 2026   3,188              
Unsecured senior notes                  
Unsecured senior notes                  
Number of maturities for debt issued | item 2                
Aggregate principal amount | $         $ 500     $ 1,000 $ 1,000
Carrying value   9,386   12,854          
Unamortized discount and debt issuance costs   101   118          
Total principal amounts of unsecured senior notes   9,487   12,972          
Debt discount ¥ 79           ¥ 37    
Debt issuance costs ¥ 36           ¥ 45    
Future principal payments for unsecured senior notes due                  
Due in 2026   3,188              
Due in 2030   4,431              
Due in 2050   ¥ 1,868              
Debt instrument maturity date   Apr. 29, 2021 Apr. 29, 2021            
Repayments of debt   ¥ 0              
Unsecured senior notes | 3.125% notes due 2021                  
Unsecured senior notes                  
Aggregate principal amount | $                 $ 500
Interest rate (as a percent) 3.125%               3.125%
Carrying value       3,260          
Effective interest rate (as a percent)   3.37%     3.37%        
Unsecured senior notes | 3.875% notes due 2026                  
Unsecured senior notes                  
Aggregate principal amount | $                 $ 500
Interest rate (as a percent) 3.875%               3.875%
Carrying value   ¥ 3,154   3,220          
Effective interest rate (as a percent)   4.15%     4.15%        
Unsecured senior notes | 3.375% notes due 2030                  
Unsecured senior notes                  
Aggregate principal amount | $                 $ 700
Interest rate (as a percent) 3.375%               3.375%
Carrying value   ¥ 4,402   4,502          
Effective interest rate (as a percent)   3.47%     3.47%        
Unsecured senior notes | 4.125% notes due 2050                  
Unsecured senior notes                  
Aggregate principal amount | $                 $ 300
Interest rate (as a percent) 4.125%               4.125%
Carrying value   ¥ 1,830   1,872          
Effective interest rate (as a percent)   4.25%     4.25%        
Unsecured senior notes | Unsecured Senior Notes [Member]                  
Future principal payments for unsecured senior notes due                  
Debt instrument repurchase amount       78   $ 12      
Take as Extension       72   $ 10      
Unsecured Debt [Member]                  
Future principal payments for unsecured senior notes due                  
Repayments of debt | $     $ 500            
Interest Expense [Member] | Unsecured senior notes | Unsecured Senior Notes [Member]                  
Future principal payments for unsecured senior notes due                  
Debt Instrument Repurchased Gain       ¥ 11