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Parent Company Only Condensed Financial Information - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
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)