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Parent Company Only Condensed Financial Information - Condensed statements of cash flows (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash used in operating activities | ¥ 6,014,900 | $ 824,032 | ¥ 266,622 | ¥ (3,911,370)
Purchase of short-term investments | 36,969,524 | 5,064,804 | 13,547,650 | 70,578,711
Maturities of short-term investments | 37,007,903 | 5,070,062 | 16,328,255 | 81,698,532
Placements of time deposits | 5,833,946 | 799,247 | 9,961,925 | 10,245,026
Maturities of time deposits | 7,486,732 | 1,025,678 | 9,690,806 | 13,909,967
Net cash provided by investing activities | (138,087) | (18,917) | 1,762,148 | 10,609,218
Purchase of noncontrolling interests |  |  | 7,027 | 56,741
Proceeds from exercise of employees' share options | 10,268 | 1,407 | 2 | 4
Proceeds of short-term and long-term loan | 5,149,000 | 705,410 | 1,950,482 | 1,701,532
Repurchase of shares | 117,523 | 16,101 |  | 347,581
Repurchase of convertible senior notes | 6,058,432 | 830,002 | 7,675,227 | 4,201,506
Net cash used in financing activities | (2,825,383) | $ (387,076) | (5,074,685) | (4,354,919)
Parent Company [Member] |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash used in operating activities | (118,834) |  | (111,392) | (650,630)
Purchase of short-term investments | (70) |  | (3,863) | (33,683,941)
Maturities of short-term investments | 175,717 |  | 982,151 | 45,951,288
Placements of time deposits |  |  |  | (4,878,180)
Maturities of time deposits |  |  | 4,083,893 | 9,133,225
Investments and loans (to)/from subsidiaries, VIEs and VIEs' subsidiaries | 3,180,316 |  | 383,391 | (13,131,173)
Other investing activities | (147,691) |  | (76,697) | 283,028
Net cash provided by investing activities | 3,208,272 |  | 5,368,875 | 3,674,247
Purchase of noncontrolling interests |  |  | (7,027) |
Proceeds from exercise of employees' share options | 10,268 |  | 2 | 4
Proceeds from issuance of ordinary shares, net of issuance costs |  |  | 2,689,380 |
Proceeds of short-term and long-term loan | 3,100,000 |  |  |
Repurchase of shares | (117,523) |  |  | (347,581)
Repurchase of convertible senior notes | (6,058,432) |  | (7,675,227) | (4,201,506)
Net cash used in financing activities | ¥ (3,065,687) |  | ¥ (4,992,872) | ¥ (4,549,083)

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