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Fair value measurement (Details 3) - CNY (¥)
¥ in Millions
12 Months Ended 36 Months Ended 72 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2022
Investment securities              
Unrealized gain/(loss) of the investment securities ¥ (4,304) ¥ (9,344) ¥ 18,722        
Accumulated Impairment of Measurement Alternative 2,610 2,779         ¥ 2,610
Wealth Management Product [Member]              
Investment securities              
Gain (loss) from changes in fair value of product 1,921 1,514          
Other Noncurrent Assets [Member] | Wealth Management Product [Member]              
Investment securities              
Gain (loss) from changes in fair value of product ¥ (137)            
China Unicom              
Investment securities              
Total consideration for the investment         ¥ 5,000    
Percentage of disposal 15.20%            
Unrealized gain/(loss) of the investment securities ¥ 341 (388) (1,047)        
Vipshop              
Investment securities              
Total consideration for the investment           ¥ 3,917  
Unrealized gain/(loss) of the investment securities   (6,560) ¥ 4,272        
Realized loss of investment securities             (839)
ESR cayman limited              
Investment securities              
Total consideration for the investment       ¥ 1,952      
Percentage of disposal 6.30%   8.00%        
Unrealized gain/(loss) of the investment securities ¥ (1,722) (396) ¥ 1,632        
Significant Other Observable Inputs (Level 2)              
Investment securities              
Unsecured senior notes 9,045 10,020         9,045
Fair value of held to maturity debt securities 4,725 3,008         4,725
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Others, net              
Investment securities              
Impairment of investments 504 119 ¥ 202        
Bank Time Deposits [Member] | Significant Other Observable Inputs (Level 2)              
Investment securities              
Time deposits 86,780 39,282         86,780
Bank Time Deposits [Member] | Significant Other Observable Inputs (Level 2) | Other Noncurrent Assets [Member]              
Investment securities              
Investment in time deposit with maturity of more than one year ¥ 100 ¥ 5,427         ¥ 100