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Measurement of financial assets and liabilities - Transfers between levels (Details) - At fair value
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Financial instruments  
Transfers into level 3 $ 0
Level 2  
Financial instruments  
Transfers out of level 3 0
Equity and debt securities  
Financial instruments  
Transfers from level 1 to level 2 940
Transfers from level 2 to level 1 $ 2,007