Line of Business Information - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 line_of_business	Dec. 31, 2021 USD ($)	Dec. 31, 2021	Dec. 31, 2021 segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of lines of business	2			2
Cash settled deferred incentive compensation awards, accelerated expense		$ 147
Other
Segment Reporting Information [Line Items]
Cash settled deferred incentive compensation awards, accelerated expense		$ 147			$ 0	$ 0
Minimum | Investment Servicing and Management Services | Investment Servicing and Investment Management
Segment Reporting Information [Line Items]
Percentage of consolidated revenues by segment			70.00%
Minimum | Processing and Other Services | Investment Servicing and Investment Management
Segment Reporting Information [Line Items]
Percentage of consolidated revenues by segment			20.00%
Maximum | Investment Servicing and Management Services | Investment Servicing and Investment Management
Segment Reporting Information [Line Items]
Percentage of consolidated revenues by segment			80.00%
Maximum | Processing and Other Services | Investment Servicing and Investment Management
Segment Reporting Information [Line Items]
Percentage of consolidated revenues by segment			30.00%