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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, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Intangible Assets [Roll Forward]          
Beginning Balance       $ 3,107 $ 3,220
Amortization $ (26) $ (26) $ (30) (78) (89)
Foreign currency translation       (3) (7)
Ending Balance 3,026   3,124 3,026 3,124
Investment Services          
Intangible Assets [Roll Forward]          
Beginning Balance       678 758
Amortization       (54) (61)
Foreign currency translation       1 (1)
Ending Balance 625   696 625 696
Investment and Wealth Management          
Intangible Assets [Roll Forward]          
Beginning Balance       1,580 1,613
Amortization       (24) (28)
Foreign currency translation       (4) (6)
Ending Balance 1,552   1,579 1,552 1,579
Other          
Intangible Assets [Roll Forward]          
Beginning Balance       849 849
Amortization       0 0
Foreign currency translation       0 0
Ending Balance $ 849   $ 849 $ 849 $ 849