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Financial assets and liabilities - Fair Value Transfers (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Financial assets and liabilities  
Transfers of assets from Level 1 to Level 2 $ 0
Transfers of assets from Level 2 to Level 1 0
Transfers of liabilities from Level 1 to Level 2 0
Transfers of liabilities from Level 2 to Level 1 $ 0