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Variable interest entities - Schedule of results of variable interest entities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Variable Interest Entity [Line Items]    
Gross profit $ 1,837 $ 1,807
Net loss (94) 116
Net cash used in operating activities (659) (712)
Variable interest entity, primary beneficiary    
Variable Interest Entity [Line Items]    
Total revenues 84 96
Total cost of revenues (80) (87)
Gross profit 4 9
Net loss (13) (9)
Net cash used in operating activities $ (18) $ (6)