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Financial instruments - Activity in level 3 financial assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Changes in fair value measurement, assets [abstract]    
Net gains recognized in Consolidated Income Statement $ 142 $ 0
Level 3 | Financial investments | Measured at FVOCI    
Changes in fair value measurement, assets [abstract]    
Balance as of January 1 201 147
Additions 15 90
Net (losses)/gains recognized in Consolidated Statement of Comprehensive Income (34) 6
Net gains recognized in Consolidated Income Statement 0 0
Amortization 0 0
Settlements (11) 0
Balance as of June 30 171 243
Level 3 | Financial investments | Measured at FVPL    
Changes in fair value measurement, assets [abstract]    
Balance as of January 1 2 8
Additions 2 0
Net (losses)/gains recognized in Consolidated Statement of Comprehensive Income 0 0
Net gains recognized in Consolidated Income Statement 0 2
Amortization (1) (2)
Settlements 0 (5)
Balance as of June 30 $ 3 $ 3