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Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Beginning balance $ 7,446 $ 6,022
Acquisitions 122 1,512
Foreign currency translation (12) (88)
Ending balance 7,556 7,446
Decrease in intangible assets (93)  
Investment Servicing    
Goodwill [Roll Forward]    
Beginning balance 7,180 5,752
Acquisitions 122 1,512
Foreign currency translation (13) (84)
Ending balance 7,289 7,180
Decrease in intangible assets (93)  
Investment Management    
Goodwill [Roll Forward]    
Beginning balance 266 270
Acquisitions 0 0
Foreign currency translation 1 (4)
Ending balance 267 $ 266
Decrease in intangible assets 0  
CRD Acquisition    
Goodwill [Roll Forward]    
Increase to goodwill 113  
Decrease in intangible assets $ (93)