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Fair value measurement of financial assets and liabilities - Summary of fair value measurement of assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets $ 822 $ 36  
Total financial liabilities 13 61  
Recurring fair value measurement | Derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 13 61  
Recurring fair value measurement | Convertible notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 0 0  
Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 7 9  
Total financial liabilities 0 0  
Level 1 | Recurring fair value measurement | Derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 0 0  
Level 1 | Recurring fair value measurement | Convertible notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 0 0  
Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 21 10  
Total financial liabilities 13 61  
Level 2 | Recurring fair value measurement | Derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 13 61  
Level 2 | Recurring fair value measurement | Convertible notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 0 0  
Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 794 17  
Total financial liabilities 0 0  
Level 3 | Recurring fair value measurement | Derivatives      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 0 0  
Level 3 | Recurring fair value measurement | Convertible notes      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial liabilities 0 0  
Consumer receivables at fair value through P&L | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 400 2  
Consumer receivables at fair value through P&L | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Consumer receivables at fair value through P&L | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Consumer receivables at fair value through P&L | Level 3      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 400 2 $ 0
Consumer receivables at fair value through P&L | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 400 2  
Consumer receivables at fair value through OCI | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 386 0  
Consumer receivables at fair value through OCI | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Consumer receivables at fair value through OCI | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Consumer receivables at fair value through OCI | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 386 0  
Derivatives | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 21 10  
Derivatives | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Derivatives | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 21 10  
Derivatives | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Equity investments | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 15 24  
Equity investments | Level 1 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 7 9  
Equity investments | Level 2 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 0 0  
Equity investments | Level 3      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets 8 15 $ 26
Equity investments | Level 3 | Recurring fair value measurement      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Total financial assets $ 8 $ 15