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Unsecured senior notes (Details)
¥ in Thousands, $ in Thousands
1 Months Ended
Apr. 30, 2016
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Apr. 30, 2016
CNY (¥)
Unsecured senior notes            
Carrying value   $ 992,917 ¥ 6,912,492 ¥ 6,786,143 ¥ 6,447,357  
Unsecured senior notes            
Unsecured senior notes            
Number of maturities for debt issued | item 2          
Aggregate principal amount | $ $ 1,000,000          
Carrying value     6,912,492 6,786,143 6,447,357  
Unamortized discount and debt issuance costs     63,708 77,057 86,843  
Total principal amounts of unsecured senior notes     6,976,200 6,863,200 6,534,200  
Debt discount           ¥ 79,289
Debt issuance costs           ¥ 35,727
Future principal payments for unsecured senior notes due            
Due in 2021     3,488,100      
Due in 2026     3,488,100      
Debt repayable more than one year     3,488,100      
Debt repayable more than five years     3,488,100      
Unsecured senior notes | 3.125% notes due 2021            
Unsecured senior notes            
Aggregate principal amount | $ $ 500,000          
Interest rate (as a percent) 3.125%         3.125%
Carrying value     ¥ 3,477,276 3,413,264 3,242,565  
Effective interest rate (as a percent)   3.37% 3.37%      
Unsecured senior notes | 3.875% notes due 2026            
Unsecured senior notes            
Aggregate principal amount | $ $ 500,000          
Interest rate (as a percent) 3.875%         3.875%
Carrying value     ¥ 3,435,216 ¥ 3,372,879 ¥ 3,204,792  
Effective interest rate (as a percent)   4.15% 4.15%