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Unsecured senior notes (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2016
CNY (¥)
item
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Jan. 31, 2020
CNY (¥)
Jan. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Apr. 30, 2016
USD ($)
Unsecured senior notes              
Carrying value   ¥ 9,594,556,000 $ 1,470,430,000     ¥ 6,912,492,000  
Future principal payments for unsecured senior notes due              
Due in 2021   0          
Due in 2026   9,709,051,000          
Unsecured senior notes              
Unsecured senior notes              
Number of maturities for debt issued | item 2            
Aggregate principal amount | $         $ 1,000,000,000   $ 1,000,000,000
Carrying value   12,854,438,000       6,912,492,000  
Unamortized discount and debt issuance costs   117,063,000       63,708,000  
Total principal amounts of unsecured senior notes   12,971,501,000       6,976,200,000  
Debt discount ¥ 79,289,000     ¥ 36,805,000      
Debt issuance costs ¥ 35,727,000     ¥ 44,681,000      
Future principal payments for unsecured senior notes due              
Due in 2021   3,262,450,000          
Due in 2026   3,262,450,000          
Due in 2030   4,534,805,000          
Due in 2050   1,911,796,000          
Unsecured senior notes | 3.125% notes due 2021              
Unsecured senior notes              
Aggregate principal amount | $             $ 500,000,000
Interest rate (as a percent) 3.125%           3.125%
Carrying value   ¥ 3,259,882,000       3,477,276,000  
Effective interest rate (as a percent)   3.37% 3.37%        
Unsecured senior notes | 3.875% notes due 2026              
Unsecured senior notes              
Aggregate principal amount | $             $ 500,000,000
Interest rate (as a percent) 3.875%           3.875%
Carrying value   ¥ 3,219,927,000       ¥ 3,435,216,000  
Effective interest rate (as a percent)   4.15% 4.15%        
Unsecured senior notes | 3.375% notes due 2030              
Unsecured senior notes              
Aggregate principal amount | $             $ 700,000,000
Interest rate (as a percent) 3.375%           3.375%
Carrying value   ¥ 4,502,213,000          
Effective interest rate (as a percent)   3.47% 3.47%        
Unsecured senior notes | 4.125% notes due 2050              
Unsecured senior notes              
Aggregate principal amount | $             $ 300,000,000
Interest rate (as a percent) 4.125%           4.125%
Carrying value   ¥ 1,872,416,000          
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   ¥ 78,300,000 $ 12,000,000        
Take as Extension   72,326,000 $ 10,224,000        
Interest Expense [Member] | Unsecured senior notes | Unsecured Senior Notes [Member]              
Future principal payments for unsecured senior notes due              
Debt Instrument Repurchased Gain   ¥ 11,101,000