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Financial instruments - Activity in level 3 financial assets (Details) - Level 3 - Financial investments - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Measured at FVOCI    
Changes in fair value measurement, assets [abstract]    
Balance as of January 1 $ 88 $ 46
Additions 53 19
Gains recognized in Consolidated Statement of Comprehensive Income 2 1
Unrealized (losses) in Consolidated Income Statement 0 0
Amortization 0 0
Settlement 0 (1)
Balance as of June 30 143 65
Measured at FVPL    
Changes in fair value measurement, assets [abstract]    
Balance as of January 1 20 6
Additions 8 0
Gains recognized in Consolidated Statement of Comprehensive Income 0 0
Unrealized (losses) in Consolidated Income Statement (4) (1)
Amortization (1) 0
Settlement 0 0
Balance as of June 30 $ 23 $ 5