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Taxation (Details 3) - CNY (¥)
¥ / shares in Units, ¥ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of differences between statutory tax rate and effective tax rate        
Statutory income tax rate (as a percent) 25.00% 25.00% 25.00%  
Tax effect of preferential tax rates and tax holiday 86.00% (2.30%) (8.10%)  
Tax effect of tax-exempt entities (as a percent) (143.70%) (16.80%) 3.70%  
Effect on tax rates in different tax jurisdiction (as a percent) (2.30%) (0.50%) (3.90%)  
Tax effect of non-deductible expenses (as a percent) (13.80%) 0.50% 5.70%  
Tax effect of non-taxable income (as a percent) 1.40% 0.00% (1.00%)  
Tax effect of Super Deduction and others (as a percent) 105.90% (4.20%) (13.20%)  
Changes in valuation allowance (as a percent) (131.60%) 1.20% 5.00%  
Effective tax rates (as a percent) (73.10%) 2.90% 13.20%  
Effect of tax holiday        
Tax holiday effect ¥ 2,219 ¥ 1,153 ¥ 1,116  
Effect of tax holiday on basic net income/(loss) per share ¥ 0.71 ¥ 0.38 ¥ 0.38  
Effect of tax holiday on diluted net income/(loss) per share ¥ 0.71 ¥ 0.37 ¥ 0.38  
Deferred tax assets        
Net operating loss carry forwards and others ¥ 6,303 ¥ 3,145    
Deferred revenues 553 208    
Inventory valuation allowance 575 498    
Allowance for doubtful accounts 603 382    
Unrealized fair value losses for certain investments 747 589    
Less: valuation allowance (7,670) (4,289) ¥ (3,674) ¥ (2,996)
Net deferred tax assets 1,111 533    
Deferred tax liabilities        
Intangible assets arisen from business combination 1,454 1,560    
Accelerated tax depreciation and others 443 362    
Total deferred tax liabilities 1,897 ¥ 1,922    
Company's subsidiaries incorporated in Singapore and Hong Kong        
Net operating loss carry forwards        
Net operating loss carry forwards 10,905      
Company's subsidiaries, consolidated VIEs and VIEs' subsidiaries established in PRC and Indonesia        
Net operating loss carry forwards        
Net operating loss carry forwards ¥ 17,140