v3.26.1
Parent Company Only Condensed Financial Information - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities ¥ 7,147,100 $ 1,022,023 ¥ 6,014,854 ¥ 266,622
Purchase of short-term investments 85,638,931 12,246,204 36,969,524 13,547,650
Maturity of short-term investments 81,815,086 11,699,402 37,007,903 16,328,255
Placement of time deposits 10,490,794 1,500,164 5,833,946 9,961,925
Maturity of time deposits 8,411,880 1,202,883 7,486,732 9,690,806
Net cash provided by/(used in) investing activities (9,340,614) (1,335,690) (138,087) 1,762,148
Purchase of noncontrolling interests 1,067 153   7,027
Proceeds from exercise of employees' share options 6,559 938 10,268 2
Proceeds from issuance of convertible senior notes, net of issuance costs 4,886,978 698,828 100,000  
Proceeds of long-term loans 2,699,000 385,952 5,149,000 1,950,482
Repurchase of shares (822,713) (117,645) (117,523)  
Repurchase of convertible senior notes (474) (68) (6,058,432) (7,675,227)
Net cash (used in)/provided by financing activities 4,087,283 $ 584,474 (2,825,383) (5,074,685)
Parent Company [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities (120,821)   (118,834) (111,392)
Purchase of short-term investments (427,465)   (70) (3,863)
Maturity of short-term investments 422,568   175,717 982,151
Placement of time deposits (211,779)      
Maturity of time deposits       4,083,893
Investments and loans from/(to) subsidiaries, VIEs and VIEs' subsidiaries (3,506,156)   3,180,316 383,391
Other investing activities (352,608)   (147,691) (76,697)
Net cash provided by/(used in) investing activities (4,075,440)   3,208,272 5,368,875
Purchase of noncontrolling interests       (7,027)
Proceeds from exercise of employees' share options 6,559   10,268 2
Proceeds from issuance of ordinary shares, net of issuance costs       2,689,380
Proceeds from issuance of convertible senior notes, net of issuance costs 4,886,978      
Proceeds of long-term loans     3,100,000  
Repayment of long-term loans (31,000)      
Repurchase of shares (822,713)   (117,523)  
Repurchase of convertible senior notes (474)   (6,058,432) (7,675,227)
Net cash (used in)/provided by financing activities ¥ 4,039,350   ¥ (3,065,687) ¥ (4,992,872)