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Fair value measurement (Details 3) - CNY (¥) ¥ in Millions |  | 12 Months Ended | 24 Months Ended | 48 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 01, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2021
Investment securities |  |  |  |  |  |  |  |  |
Unrealized gain/(loss) of the investment securities |  | ¥ 9,344 | ¥ 18,722 | ¥ 3,414 |  |  |  |  |
Accumulated Impairment of Measurement Alternative |  | 2,779 | 2,660 |  |  |  |  | ¥ 2,660 | ¥ 2,779
China Unicom |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Total consideration for the investment |  |  |  |  |  | ¥ 5,000 |  |  |
Unrealized gain/(loss) of the investment securities |  | (388) | (1,047) | 527 |  |  |  |  |
Vipshop |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Total consideration for the investment |  |  |  |  |  | ¥ 2,795 | ¥ 1,122 |  |
Unrealized gain/(loss) of the investment securities |  | (6,560) | ¥ 4,272 | 3,082 |  |  |  |  |
Farfetch |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Total consideration for the investment |  |  |  |  |  |  |  | 2,975 |
Percentage of disposal |  |  | 44.20% |  |  |  |  |  |
Unrealized gain/(loss) of the investment securities |  |  | ¥ 8,427 | (2,091) |  |  |  |  |
Realized gain of investment |  |  |  |  |  |  |  |  | 13,308
ESR cayman limited |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Total consideration for the investment |  |  |  |  | ¥ 1,952 |  |  |  |
Percentage of disposal | 3.40% |  | 8.00% |  |  |  |  |  |
Unrealized gain/(loss) of the investment securities |  | (396) | ¥ 1,632 | 1,777 |  |  |  |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Unsecured senior notes |  | 10,020 | 14,008 |  |  |  |  | 14,008 | 10,020
Fair value of held to maturity debt securities |  | 3,008 | 17,470 |  |  |  |  | 17,470 | 3,008
Significant Unobservable Inputs (Level 3) | Nonrecurring basis | Others, net |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Impairment of investments |  | 119 | 202 | ¥ 1,612 |  |  |  |  |
Bank Time Deposits [Member] | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |  |
Time deposits |  | 39,282 | 36,473 |  |  |  |  | 36,473 | 39,282
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 |  | ¥ 5,427 | ¥ 5,073 |  |  |  |  | ¥ 5,073 | ¥ 5,427

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