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Business acquisition - Additional information (Detail) - CNY (¥) ¥ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Jun. 30, 2020 | Apr. 30, 2020 | Apr. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Statement Lineitems [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 9 years 7 months 6 days | 9 years 6 months
Jiangsu Five Star [Member] |  |  |  |  |  |
Statement Lineitems [Line Items] |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  | ¥ 1,274 |  |
Business Acquisition, Percentage of Equity Interest |  |  |  | 46.00% |  |
Business Acquisition, Percentage of Equity Interest Acquired |  | 17.00% | 37.00% |  |  |
Acquisition of equity interest by loan conversion |  |  | ¥ 1,025 | ¥ 1,025 |  |
Gain On Revaluation of equity interest |  |  | 442 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash |  |  | 1,720 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  | 1,652 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | ¥ 4,102 |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 19 years |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  | ¥ 428 |  |  |  |
Kuayue Express [Member] |  |  |  |  |  |
Statement Lineitems [Line Items] |  |  |  |  |  |
Percenatge of ordinary shares acquired | 60.20% |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 9 years |  |  |  |  |
Business Combination, Consideration Transferred | ¥ 2,966 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 1,376 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | 986 |  |  |  |  |
Business acquisition recognized identifiable assets and liabilities assumed current assets trade receivables | 830 |  |  |  |  |
Business acquistion trade receivables gross contractual amount | 924 |  |  |  |  |
Business acquisition trade receivables amount not expected to be collected | ¥ 94 |  |  |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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