Summary of Significant Accounting Policies - Product warranties, current and non-current, revenue recognition, selling and marketing expenses and government grants (Details) - CNY (¥) ¥ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Summary of Significant Accounting Policies | |||
| Accrued warranty | ¥ 7,145,898 | ¥ 5,159,787 | ¥ 3,251,112 |
| Including: Accrued warranty, current | 1,602,897 | 518,441 | |
| Accrued warranty, non-current | 5,543,001 | 4,641,346 | |
| Advertising, marketing and promotional expenses | 1,601,474 | 1,576,325 | 1,411,474 |
| Government grants | ¥ 1,609,881 | ¥ 1,728,877 | ¥ 1,080,373 |
| Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) |
| Government subsidies | |||
| Summary of Significant Accounting Policies | |||
| Liabilities from government grants | ¥ 476,047 | ¥ 538,904 | |
| Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent | |
| X | ||||||||||
- Definition Amount of liability from government assistance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Indicates line item in statement of financial position that includes liability from government assistance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase (decrease) in income from government assistance, classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Indicates line item in statement of income or comprehensive income that includes increase (decrease) in income from government assistance, classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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