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Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance     $ 1,613 $ 1,750 $ 1,750
Acquisitions         16
Divestitures         (11)
Amortization $ (48) $ (54) (98) (106) (214)
Foreign currency translation and other, net     (15)   72
Ending balance 1,500   1,500   1,613
Investment Servicing          
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance     1,432 1,539 1,539
Acquisitions         16
Divestitures         (11)
Amortization     (83)   (183)
Foreign currency translation and other, net     (15)   71
Ending balance 1,334   1,334   1,432
Investment Management          
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance     181 $ 211 211
Acquisitions         0
Divestitures         0
Amortization     (15)   (31)
Foreign currency translation and other, net     0   1
Ending balance $ 166   $ 166   $ 181