Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance	$ 5,814	$ 5,671
Acquisitions	20	236
Divestitures and other reductions	(1)	(11)
Foreign currency translation	22	(82)
Ending balance	5,855	5,814
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	5,550	5,641
Acquisitions	20	0
Divestitures and other reductions	(1)	11
Foreign currency translation	22	(80)
Ending balance	5,591	5,550
Investment Management
Goodwill [Roll Forward]
Beginning balance	264	30
Acquisitions	0	236
Divestitures and other reductions	0	0
Foreign currency translation	0	(2)
Ending balance	$ 264	$ 264