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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, 2022
Jun. 30, 2021
Measured at FVOCI    
Changes in fair value measurement, assets [abstract]    
Balance as of January 1 $ 46 $ 28
Additions 19 9
Gain recognized in Consolidated Statement of Comprehensive Income 1 0
Unrealized (losses) in Consolidated Income Statement 0 0
Amortization 0 0
Settlement (1) 0
Balance as of June 30 65 37
Measured at FVPL    
Changes in fair value measurement, assets [abstract]    
Balance as of January 1 6 24
Additions 0 0
Gain recognized in Consolidated Statement of Comprehensive Income 0 0
Unrealized (losses) in Consolidated Income Statement (1) (1)
Amortization 0 (8)
Settlement 0 0
Balance as of June 30 $ 5 $ 15