Goodwill and Other Intangible Assets - Changes In The Carrying Amount Of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance	$ 7,556	$ 7,446
Acquisitions		122
Foreign currency translation	(18)	(12)
Ending balance	7,538	7,556
Finite-lived intangible assets acquired		93
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	7,289	7,180
Acquisitions		122
Foreign currency translation	(16)	(13)
Ending balance	7,273	7,289
Finite-lived intangible assets acquired		93
Goodwill, period increase (decrease)		113
Investment Management
Goodwill [Roll Forward]
Beginning balance	267	266
Acquisitions		0
Foreign currency translation	(2)	1
Ending balance	$ 265	267
Finite-lived intangible assets acquired		$ 0