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Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) € in Millions, $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance		$ 7,683		$ 7,621	$ 7,683
Acquisitions				3	66
Divestiture					(17)
Foreign currency translation				(129)	(111)
Ending balance				7,495	7,621
Investment Servicing
Goodwill [Roll Forward]
Beginning balance		7,413		7,354	7,413
Acquisitions				3	66
Divestiture					(17)
Foreign currency translation				(125)	(108)
Ending balance				7,232	7,354
Investment Management
Goodwill [Roll Forward]
Beginning balance		270		267	270
Acquisitions				0	0
Divestiture					0
Foreign currency translation				(4)	(3)
Ending balance				$ 263	$ 267
Fideuram Bank Luxembour \| Investment Servicing
Goodwill [Roll Forward]
Payment for acquisition		$ 258	€ 220
Mercatus, Inc \| Investment Servicing
Goodwill [Roll Forward]
Payment for acquisition	$ 88