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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 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance     $ 1,613 $ 1,750 $ 1,750
Acquisitions     10   16
Divestitures         (11)
Amortization $ (47) $ (54) (145) (160) (214)
Foreign currency translation     (17)   72
Ending balance 1,461   1,461   1,613
Investment Servicing          
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance     1,432 1,539 1,539
Acquisitions     10   16
Divestitures         (11)
Amortization     (123)   (183)
Foreign currency translation     (17)   71
Ending balance 1,302   1,302   1,432
Investment Management          
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance     181 $ 211 211
Acquisitions     0   0
Divestitures         0
Amortization     (22)   (31)
Foreign currency translation     0   1
Ending balance $ 159   $ 159   $ 181