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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, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Beginning balance $ 7,556 $ 7,446
Acquisitions   122
Foreign currency translation 127 (12)
Ending balance 7,683 7,556
Decrease in intangible assets   (93)
Investment Servicing    
Goodwill [Roll Forward]    
Beginning balance 7,289 7,180
Acquisitions   122
Foreign currency translation 124 (13)
Ending balance 7,413 7,289
Decrease in intangible assets   (93)
Investment Management    
Goodwill [Roll Forward]    
Beginning balance 267 266
Acquisitions   0
Foreign currency translation 3 1
Ending balance 270 267
Decrease in intangible assets   $ 0
CRD Acquisition    
Goodwill [Roll Forward]    
Increase to goodwill 113  
Decrease in intangible assets $ (93)