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Goodwill and intangible assets - Goodwill (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]          
Beginning balance   $ 16,598,000,000 $ 16,261,000,000    
Dispositions   (18,000,000)      
Business realignment     0    
Foreign currency translation   206,000,000 77,000,000    
Other   (13,000,000)      
Goodwill $ 17,453,000,000 17,453,000,000 17,018,000,000 $ 17,278,000,000 $ 16,941,000,000
Accumulated impairment losses (680,000,000) (680,000,000) (680,000,000) (680,000,000) (680,000,000)
Ending balance 16,773,000,000 16,773,000,000 16,338,000,000    
Securities Services          
Goodwill [Roll Forward]          
Beginning balance   7,331,000,000 7,004,000,000    
Dispositions   (18,000,000)      
Business realignment     (51,000,000)    
Foreign currency translation   94,000,000 15,000,000    
Other   (13,000,000)      
Goodwill 7,394,000,000 7,394,000,000 6,968,000,000 7,331,000,000 7,004,000,000
Accumulated impairment losses 0 0 0 0 0
Ending balance 7,394,000,000 7,394,000,000 6,968,000,000    
Market and Wealth Services          
Goodwill [Roll Forward]          
Beginning balance   1,475,000,000 1,429,000,000    
Dispositions   0      
Business realignment     48,000,000    
Foreign currency translation   6,000,000 4,000,000    
Other   0      
Goodwill 1,481,000,000 1,481,000,000 1,481,000,000 1,475,000,000 1,429,000,000
Accumulated impairment losses 0 0 0 0 0
Ending balance 1,481,000,000 1,481,000,000 1,481,000,000    
Investment and Wealth Management          
Goodwill [Roll Forward]          
Beginning balance   7,792,000,000 7,828,000,000    
Dispositions   0      
Business realignment     3,000,000    
Foreign currency translation   106,000,000 58,000,000    
Other   0      
Goodwill 8,578,000,000 8,578,000,000 8,569,000,000 8,472,000,000 8,508,000,000
Accumulated impairment losses (680,000,000) (680,000,000) (680,000,000) $ (680,000,000) $ (680,000,000)
Ending balance 7,898,000,000 7,898,000,000 $ 7,889,000,000    
Allocated goodwill 6,200,000,000 $ 6,200,000,000      
Goodwill impairment $ 0