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Acquisitions and dispositions - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Contingent payments $ 0      
Goodwill 17,271,000,000 $ 17,512,000,000 $ 17,487,000,000 $ 17,496,000,000
Acquisition in 2022        
Business Acquisition [Line Items]        
Potential obligation to pay additional consideration, lower range 15,000,000      
Potential obligation to pay additional consideration, upper range $ 45,000,000      
Period for contingent consideration payment 3 years      
Acquisition in 2021        
Business Acquisition [Line Items]        
Goodwill   99,000,000    
Intangible assets acquired   $ 70,000,000