Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Goodwill (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning balance	$ 5,671	$ 5,826
Acquisitions	236	0
Divestitures and other reductions	(11)	0
Foreign currency translation	15	(155)
Ending balance	5,911	5,671
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	5,641	5,793
Acquisitions	0	0
Divestitures and other reductions	(11)	0
Foreign currency translation	15	(152)
Ending balance	5,645	5,641
Investment Management
Goodwill [Roll Forward]
Beginning balance	30	33
Acquisitions	236	0
Divestitures and other reductions	0	0
Foreign currency translation	0	(3)
Ending balance	$ 266	$ 30