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Revenue From Contracts With Customers (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Allowance for doubtful accounts $ 15 $ 17 $ 21
Market Platforms | Services transferred at a point in time | Trading Services, net      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenue recognized (percentage) 93.10% 93.60% 94.80%
Market Platforms | Services transferred over time | Trading Services, net      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenue recognized (percentage) 6.90% 6.40% 5.20%