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Share-based compensation (Details 2) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2023 CNY (¥) shares | Dec. 31, 2023 CNY (¥) $ / shares shares | Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ | ¥ 4,804 |  | ¥ 7,548 |  | ¥ 9,134 |  |  |
Share Incentive Plan | Employee and non-employee | RSU | Service-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 71,641,054 |  | 95,108,866 |  | 108,269,242 |  |  |
Granted (in shares) | 16,682,380 |  | 13,951,100 |  | 30,069,498 |  |  |
Vested (in shares) | (19,416,652) |  | (23,123,292) |  | (23,834,466) |  |  |
Forfeited or cancelled | (14,918,722) |  | (14,295,620) |  | (19,395,408) |  |  |
Unvested at the end of the year (in shares) | 53,988,060 |  | 71,641,054 |  | 95,108,866 |  | 108,269,242 |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ / shares |  | $ 27.56 |  | $ 25.89 |  | $ 19.62 |  |
Granted (in dollars per share) | $ / shares |  | 18.24 |  | 29.81 |  | 39.93 |  |
Vested (in dollars per share) | $ / shares |  | 24.83 |  | 23.04 |  | 18.89 |  |
Forfeited or cancelled | $ / shares |  | 28.48 |  | 25.94 |  | 21.3 |  |
Unvested at the end of the year (in dollars per share) | $ / shares |  | $ 25.4 |  | 27.56 |  | 25.89 | $ 19.62 |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ | ¥ 1,840 |  | ¥ 3,877 |  | ¥ 4,129 |  |  |
Unrecognized share-based compensation expense related to awards other than options | ¥ | ¥ 3,765 | $ 3,765 |  |  |  |  |  |
Weighted-average period over which share-based compensation expense is expected to be recognized | 3 years 3 months 18 days |  |  |  |  |  |  |
Total fair value of RSUs vested | ¥ | ¥ 2,930 |  | 4,590 |  | 6,359 |  |  |
Total intrinsic value of RSUs vested | ¥ | ¥ 2,930 |  | ¥ 4,590 |  | ¥ 6,359 |  |  |
Share Incentive Plan | Employee and non-employee | Options | Service-based |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | 2,314,136 |  | 2,937,112 |  | 4,907,060 |  |  |
Granted (in shares) | 0 |  | 0 |  | 0 |  |  |
Exercised (in shares) | (1,485,726) |  | (620,476) |  | (1,962,856) |  |  |
Forfeited or cancelled | (24,590) |  | (2,500) |  | (7,092) |  |  |
Outstanding at the end of the year (in shares) | 803,820 |  | 2,314,136 |  | 2,937,112 |  | 4,907,060 |
Vested and expected to vest at the end of the year (in shares) | 799,483 | 799,483 |  |  |  |  |  | 799,483
Exercisable at the end of the year (in shares) | 787,140 | 787,140 |  |  |  |  |  | 787,140
Weighted Average Exercise Price |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) | $ / shares |  | $ 7.29 |  | 6.95 |  | 6.38 |  |
Exercised (in dollars per share) | $ / shares |  | 4.44 |  | 5.7 |  | 5.49 |  |
Forfeited or cancelled (in dollars per share) | $ / shares |  | 11.65 |  | 3.96 |  | 13.42 |  |
Outstanding at the end of the year (in dollars per share) | $ / shares |  | $ 12.43 |  | $ 7.29 |  | $ 6.95 | $ 6.38 |
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 12.43
Exercisable at the end of the year (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 12.42
Weighted Average Remaining Contractual Term (years) |  |  |  |  |  |  |  |
Outstanding at the end of the year | 3 years 8 months 12 days |  | 2 years 2 months 12 days |  | 2 years 10 months 24 days |  | 3 years |
Vested and expected to vest at the end of the year | 3 years 8 months 12 days |  |  |  |  |  |  |
Exercisable at the end of the year | 3 years 7 months 6 days |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Outstanding at the end of the year (in dollars) | $ |  |  |  | $ 48 |  | $ 82 | $ 184 | $ 2
Vested and expected to vest at the end of the year (in dollars) | $ |  |  |  |  |  |  |  | 2
Exercisable at the end of the year (in dollars) | $ |  |  |  |  |  |  |  | $ 2
Additional disclosures |  |  |  |  |  |  |  |
Weighted-average period over which share-based compensation expense is expected to be recognized | 9 months 18 days |  |  |  |  |  |  |
Total intrinsic value of options exercised | ¥ | ¥ 98 |  | ¥ 98 |  | ¥ 453 |  |  |
Share Incentive Plan | Non-employees | RSU | Service-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 5,526,834 |  |  |  |  |  |  |
Unvested at the end of the year (in shares) | 2,838,656 |  | 5,526,834 |  |  |  |  |
Share Incentive Plan | Non-employees | Options | Service-based |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | 78,706 |  |  |  |  |  |  |
Outstanding at the end of the year (in shares) | 57,206 |  | 78,706 |  |  |  |  |
Share Incentive Plan | Year two | Employee and non-employee | RSUs and options |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vesting schedule | 2 years |  |  |  |  |  |  |
Share Incentive Plan | Year ten | Employee and non-employee | RSUs and options |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vesting schedule | 6 years |  |  |  |  |  |  |

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