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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, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities ¥ (3,911,400) $ (567,097) ¥ (2,647,008) ¥ 753,103
Purchase of short-term investments 70,578,711 10,232,951 71,748,847 26,731,176
Maturities of short-term investments 81,698,532 11,845,174 60,524,888 24,921,538
Placements of time deposits 10,245,026 1,485,389 10,697,444 10,907,296
Maturities of time deposits 13,909,967 2,016,756 7,655,147 7,670,373
Net cash (used in)/provided by investing activities 10,609,218 1,538,192 (24,578,111) (8,906,821)
Proceeds from exercise of employees' share options 4 1 3 3
Repurchase of convertible senior notes 4,201,506 609,161    
Repurchase of shares 347,581 50,395    
Net cash provided by/(used in) financing activities (4,354,919) $ (631,404) 30,389,152 8,335,419
Parent Company [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities (650,630)   (104,672) (113,574)
Purchase of short-term investments (33,683,941)   (48,781,106) (455,347)
Maturities of short-term investments 45,951,288   36,744,305 465,726
Placements of time deposits (4,878,180)   (10,658,126) (9,604,228)
Maturities of time deposits 9,133,225   7,600,828 4,925,241
Investments in and loans to subsidiaries, VIEs and VIEs' subsidiaries (13,131,173)   (11,168,671) (5,102,250)
Other investing activities 283,028   (1,153,850) (600,067)
Net cash (used in)/provided by investing activities 3,674,247   (27,416,620) (10,370,925)
Proceeds from exercise of employees' share options 4   3 3
Proceeds from issuance of ordinary shares, net of issuance costs of US$563 and HKD337,143, nil, respectively     19,288,423 2,817,458
Repurchase of convertible senior notes (4,201,506)      
Proceeds from issuance of convertible senior notes, net of issuance costs of US$13,857, US$23,402 and nil, respectively     10,085,520 5,594,779
Repurchase of shares (347,581)      
Net cash provided by/(used in) financing activities ¥ (4,549,083)   ¥ 29,373,946 ¥ 8,412,240