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Acquisitions and Divestiture (2021 Divestiture) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021
Verafin
Business Acquisition [Line Items]
Measurement period adjustment		$ 9
eSpeed | Common stock
Business Acquisition [Line Items]
Contingent future issuance of common stock (in shares)	6,200,000
Discontinued Operations, Disposed of by Sale | U.S. Fixed Income business
Business Acquisition [Line Items]
Gain on disposition of business, before taxes	$ 84

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