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Goodwill and intangible assets - Intangible Assets by Type (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Intangible Assets by Major Class [Line Items]        
Gross carrying amount $ 4,203 $ 4,219    
Accumulated amortization (1,369) (1,368)    
Net carrying amount 2,834 2,851 $ 2,824 $ 2,854
Finite-lived Intangible Assets        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount 1,615 1,643    
Accumulated amortization (1,369) (1,368)    
Net carrying amount $ 246 275    
Finite-lived Intangible Assets | Weighted Average        
Intangible Assets by Major Class [Line Items]        
Remaining weighted- average amortization period 11 years      
Finite-lived Intangible Assets | Customer contracts—Investment Services | Securities Services        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount $ 789 779    
Accumulated amortization (617) (593)    
Net carrying amount 172 186    
Finite-lived Intangible Assets | Customer contracts—Investment Services | Market and Wealth Services        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount 269 269    
Accumulated amortization (268) (266)    
Net carrying amount $ 1 3    
Finite-lived Intangible Assets | Customer contracts—Investment Services | Weighted Average | Securities Services        
Intangible Assets by Major Class [Line Items]        
Remaining weighted- average amortization period 12 years      
Finite-lived Intangible Assets | Customer contracts—Investment Services | Weighted Average | Market and Wealth Services        
Intangible Assets by Major Class [Line Items]        
Remaining weighted- average amortization period 1 year      
Finite-lived Intangible Assets | Customer relationships        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount $ 517 553    
Accumulated amortization (469) (495)    
Net carrying amount $ 48 58    
Finite-lived Intangible Assets | Customer relationships | Weighted Average        
Intangible Assets by Major Class [Line Items]        
Remaining weighted- average amortization period 7 years      
Finite-lived Intangible Assets | Other        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount $ 40 42    
Accumulated amortization (15) (14)    
Net carrying amount $ 25 28    
Finite-lived Intangible Assets | Other | Weighted Average        
Intangible Assets by Major Class [Line Items]        
Remaining weighted- average amortization period 11 years      
Indefinite-lived Intangible Assets        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount $ 2,588 2,576    
Net carrying amount 2,588 2,576    
Indefinite-lived Intangible Assets | Tradenames        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount 1,294 1,291    
Net carrying amount 1,294 1,291    
Indefinite-lived Intangible Assets | Customer relationships        
Intangible Assets by Major Class [Line Items]        
Gross carrying amount 1,294 1,285    
Net carrying amount $ 1,294 $ 1,285