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Goodwill and intangible assets - Goodwill by Business Segment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill [Roll Forward]    
Beginning balance $ 17,316 $ 17,618
Foreign currency translation 39 (14)
Ending balance 17,355 17,604
Investment Management    
Goodwill [Roll Forward]    
Beginning balance 9,000 9,207
Foreign currency translation 21 (32)
Ending balance 9,021 9,175
Investment Services    
Goodwill [Roll Forward]    
Beginning balance 8,269 8,366
Foreign currency translation 18 18
Ending balance 8,287 8,384
Other    
Goodwill [Roll Forward]    
Beginning balance 47 45
Foreign currency translation 0 0
Ending balance $ 47 $ 45