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Long-term debt - Summary of the Company's non-current portion of unsecured senior notes (Details)
$ in Millions
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Jan. 31, 2023
USD ($)
Jan. 31, 2023
CNY (¥)
Nov. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Debt Instrument [Line Items]              
Carrying value ¥ 95,153,000 ¥ 646,000          
Unamortized discount and debt issuance costs 539,000 6,000          
Total principal amounts of unsecured senior notes 95,692,000 652,000          
April 2026 Notes [Member]              
Debt Instrument [Line Items]              
Carrying value 86,000            
Unamortized discount and debt issuance costs (400) (23,600,000)          
Total principal amounts of unsecured senior notes ¥ 86,300 3,040,900,000         $ 500.0
Effective interest rate 1.74%           1.375%
2027 Notes [Member]              
Debt Instrument [Line Items]              
Carrying value   646,000          
Unamortized discount and debt issuance costs ¥ (4,200) (5,700)          
Total principal amounts of unsecured senior notes ¥ 700,000 700,000       $ 800.0  
Effective interest rate 1.52%         1.25%  
December 2026 Notes [Member]              
Debt Instrument [Line Items]              
Carrying value ¥ 95,067,000            
Unamortized discount and debt issuance costs (500,000) (26,200,000)          
Total principal amounts of unsecured senior notes ¥ 95,600,000 ¥ 3,062,600,000 $ 384.8 ¥ 2,600,000,000 $ 1,600.0    
Effective interest rate 0.80%       0.50%