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Goodwill and intangible assets - Goodwill by Business Segment (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
reporting_unit
Jun. 30, 2017
USD ($)
reporting_unit
Jun. 30, 2016
USD ($)
Goodwill [Roll Forward]      
Beginning balance   $ 17,316,000,000 $ 17,618,000,000
Acquisitions     29,000,000
Foreign currency translation   141,000,000 (146,000,000)
Other     0
Ending balance $ 17,457,000,000 $ 17,457,000,000 17,501,000,000
Impairment testing      
Number of reportable segments | reporting_unit   3  
Number of reporting units | reporting_unit 8    
Goodwill impairment recognized $ 0    
Investment Management      
Goodwill [Roll Forward]      
Beginning balance   $ 9,000,000,000 9,207,000,000
Acquisitions     29,000,000
Foreign currency translation   69,000,000 (121,000,000)
Other     2,000,000
Ending balance 9,069,000,000 9,069,000,000 9,117,000,000
Investment Services      
Goodwill [Roll Forward]      
Beginning balance   8,269,000,000 8,366,000,000
Acquisitions     0
Foreign currency translation   72,000,000 (25,000,000)
Other     (4,000,000)
Ending balance 8,341,000,000 8,341,000,000 8,337,000,000
Other      
Goodwill [Roll Forward]      
Beginning balance   47,000,000 45,000,000
Acquisitions     0
Foreign currency translation   0 0
Other     2,000,000
Ending balance $ 47,000,000 $ 47,000,000 $ 47,000,000