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Goodwill and intangible assets - Intangible Assets by Business Segment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Intangible Assets [Roll Forward]          
Beginning Balance       $ 2,991 $ 3,012
Disposition         (6)
Amortization $ (17) $ (17) $ (19) (51) (63)
Foreign currency translation       (38) (2)
Ending Balance 2,902   2,941 2,902 2,941
Securities Services          
Intangible Assets [Roll Forward]          
Beginning Balance       230 194
Disposition         0
Amortization       (25) (24)
Foreign currency translation       (8) 0
Ending Balance 197   170 197 170
Market and Wealth Services          
Intangible Assets [Roll Forward]          
Beginning Balance       392 414
Disposition         0
Amortization       (6) (17)
Foreign currency translation       0 0
Ending Balance 386   397 386 397
Investment and Wealth Management          
Intangible Assets [Roll Forward]          
Beginning Balance       1,520 1,555
Disposition         (6)
Amortization       (20) (22)
Foreign currency translation       (30) (2)
Ending Balance 1,470   1,525 1,470 1,525
Other          
Intangible Assets [Roll Forward]          
Beginning Balance       849 849
Disposition         0
Amortization       0 0
Foreign currency translation       0 0
Ending Balance $ 849   $ 849 $ 849 $ 849