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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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