Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance	$ 5,814	$ 5,671
Acquisitions	17	236
Divestitures and other reductions	(3)	(11)
Foreign currency translation	117	(82)
Ending balance	5,945	5,814
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	5,550	5,641
Acquisitions	17	0
Divestitures and other reductions	(3)	(11)
Foreign currency translation	114	(80)
Ending balance	5,678	5,550
Investment Management
Goodwill [Roll Forward]
Beginning balance	264	30
Acquisitions	0	236
Divestitures and other reductions	0	0
Foreign currency translation	3	(2)
Ending balance	$ 267	$ 264