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Clearing Operations (Schedule of Derivative Contracts) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($) TWh contract | Mar. 31, 2021 TWh contract
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 2,173 |
Total number of cleared contracts (in contracts) | contract | 24,948,668 | 21,942,207
Total volume in cleared power, in Terawatt hours (TWh) | TWh | 135 | 250
Commodity and seafood options, futures and forwards |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 518 |
Total number of cleared contracts (in contracts) | contract | 96,153 | 155,662
Fixed-income options and futures |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 1,345 |
Total number of cleared contracts (in contracts) | contract | 6,594,330 | 6,404,204
Stock options and futures |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 228 |
Total number of cleared contracts (in contracts) | contract | 5,113,644 | 6,306,308
Index options and futures |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 82 |
Total number of cleared contracts (in contracts) | contract | 13,144,541 | 9,076,033

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