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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, 2024 CNY (¥) shares | Dec. 31, 2024 CNY (¥) $ / shares shares | Dec. 31, 2023 CNY (¥) shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ | ¥ 2,999 |  | ¥ 4,804 |  | ¥ 7,548 |  |  |
Share Incentive Plan | Employee and non-employee | RSU | Service-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 53,988,060 |  | 71,641,054 |  | 95,108,866 |  |  |
Granted (in shares) | 43,677,248 |  | 16,682,380 |  | 13,951,100 |  |  |
Vested (in shares) | (16,805,414) |  | (19,416,652) |  | (23,123,292) |  |  |
Forfeited or cancelled | (9,876,472) |  | (14,918,722) |  | (14,295,620) |  |  |
Unvested at the end of the year (in shares) | 70,983,422 |  | 53,988,060 |  | 71,641,054 |  | 95,108,866 |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ / shares |  | $ 25.4 |  | $ 27.56 |  | $ 25.89 |  |
Granted (in dollars per share) | $ / shares |  | 15.33 |  | 18.24 |  | 29.81 |  |
Vested (in dollars per share) | $ / shares |  | 25.07 |  | 24.83 |  | 23.04 |  |
Forfeited or cancelled | $ / shares |  | 23.6 |  | 28.48 |  | 25.94 |  |
Unvested at the end of the year (in dollars per share) | $ / shares |  | $ 19.53 |  | 25.4 |  | 27.56 | $ 25.89 |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ | ¥ 1,024 |  | ¥ 1,840 |  | ¥ 3,877 |  |  |
Unrecognized share-based compensation expense related to awards other than options | ¥ | ¥ 3,622 | $ 3,622 |  |  |  |  |  |
Weighted-average period over which share-based compensation expense is expected to be recognized | 3 years |  |  |  |  |  |  |
Total fair value of RSUs vested | ¥ | ¥ 1,909 |  | ¥ 2,930 |  | ¥ 4,590 |  |  |
Share Incentive Plan | Employee and non-employee | Options | Service-based |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | 803,820 |  | 2,314,136 |  | 2,937,112 |  |  |
Granted (in shares) | 0 |  | 0 |  | 0 |  |  |
Exercised (in shares) | (122,670) |  | (1,485,726) |  | (620,476) |  |  |
Forfeited or cancelled | (35,410) |  | (24,590) |  | (2,500) |  |  |
Outstanding at the end of the year (in shares) | 645,740 |  | 803,820 |  | 2,314,136 |  | 2,937,112 |
Vested and expected to vest at the end of the year (in shares) | 645,740 | 645,740 |  |  |  |  |  | 645,740
Exercisable at the end of the year (in shares) | 645,740 | 645,740 |  |  |  |  |  | 645,740
Weighted Average Exercise Price |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) | $ / shares |  | $ 12.43 |  | 7.29 |  | 6.95 |  |
Exercised (in dollars per share) | $ / shares |  | 13.01 |  | 4.44 |  | 5.7 |  |
Forfeited or cancelled (in dollars per share) | $ / shares |  | 14.98 |  | 11.65 |  | 3.96 |  |
Outstanding at the end of the year (in dollars per share) | $ / shares |  | $ 12.18 |  | $ 12.43 |  | $ 7.29 | $ 6.95 |
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 12.18
Exercisable at the end of the year (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 12.18
Weighted Average Remaining Contractual Term (years) |  |  |  |  |  |  |  |
Outstanding at the end of the year | 3 years 3 months 18 days |  | 3 years 8 months 12 days |  | 2 years 2 months 12 days |  | 2 years 10 months 24 days |
Vested and expected to vest at the end of the year | 3 years 3 months 18 days |  |  |  |  |  |  |
Exercisable at the end of the year | 3 years 3 months 18 days |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Outstanding at the end of the year (in dollars) | $ |  |  |  | $ 2 |  | $ 48 | $ 82 | $ 3
Vested and expected to vest at the end of the year (in dollars) | $ |  |  |  |  |  |  |  | 3
Exercisable at the end of the year (in dollars) | $ |  |  |  |  |  |  |  | $ 3
Additional disclosures |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | ¥ | ¥ 2 |  | ¥ 98 |  | ¥ 98 |  |  |
Share Incentive Plan | Non-employees | RSU | Service-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 2,838,656 |  |  |  |  |  |  |
Unvested at the end of the year (in shares) | 1,865,542 |  | 2,838,656 |  |  |  |  |
Share Incentive Plan | Non-employees | Options | Service-based |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | 57,206 |  |  |  |  |  |  |
Outstanding at the end of the year (in shares) | 40,536 |  | 57,206 |  |  |  |  |
Share Incentive Plan | Year ten | Employee and non-employee | RSUs and options |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vesting schedule | 6 years |  |  |  |  |  |  |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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