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Revenue From Contracts With Customers (Revenue by Product, Service and Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses $ 3,582 $ 3,420 $ 2,903
Operating segments | Market Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 1,581 1,582 1,457
Operating segments | Capital Access Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 1,684 1,568 1,287
Operating segments | Trading Services, net | Market Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 1,019 1,037 932
Operating segments | Marketplace Technology | Market Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 562 545 525
Operating segments | Data & Listing Services | Capital Access Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 729 680 574
Operating segments | Index | Capital Access Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 486 459 324
Operating segments | Workflow & Insights | Capital Access Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 469 429 389
Operating segments | Anti-Financial Crime | Capital Access Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses 306 231 116
Reconciling items | Other revenues | Capital Access Platforms      
Disaggregation of Revenue [Line Items]      
Revenues less transaction-based expenses $ 11 $ 39 $ 43