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Acquisitions and dispositions - Narrative (Details) - USD ($)
9 Months Ended
Aug. 01, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]          
Contingent payments   $ 0      
Goodwill   16,412,000,000 $ 17,420,000,000 $ 17,512,000,000 $ 17,496,000,000
Dispositions   13,000,000 $ 5,000,000    
Disposed of by sale | HedgeMark Advisors          
Business Acquisition [Line Items]          
Gain on sale of business $ 37,000,000        
Dispositions $ 13,000,000        
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