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Clearing Operations (Investment Policy) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Clearing Operations [Line Items] |  |
Cash contributions | $ 13,902 |
Default funds and margin deposits assets | 6,570 | $ 5,911
Restricted cash and equivalents |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 5,398 | 5,074
Demand deposits |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 4,270 | 3,061
Central bank certificates |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 1,128 | 2,013
Investments |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 1,172 | 837
European government debt securities |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 443 | 414
Reverse repurchase agreements |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 457 | 152
Multilateral development bank debt securities |  |
Clearing Operations [Line Items] |  |
Default funds and margin deposits assets | 272 | 271
Nasdaq clearing members cash contributions |  |
Clearing Operations [Line Items] |  |
Cash contributions | $ 6,570 | $ 5,911

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