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Acquisition and Divestiture (2021 Divestiture) (Details) $ in Millions | 1 Months Ended
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Jun. 30, 2021 USD ($) shares
eSpeed | Common stock |
Business Acquisition [Line Items] |
Contingent future issuance of common stock (in shares) | 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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