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Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Aug. 26, 2022
$ / shares
Dec. 31, 2022
USD ($)
company
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cash and cash equivalents   $ 502,000,000 $ 393,000,000 $ 2,745,000,000    
Net proceeds from senior note   539,000,000        
Restricted cash and cash equivalents   22,000,000 29,000,000 37,000,000    
Allowance for doubtful accounts   15,000,000 17,000,000 21,000,000    
Total equity   6,164,000,000 6,405,000,000 6,436,000,000    
Equity security impairment loss   0 0 0    
Asset impairment charges   8,000,000 4,000,000 14,000,000    
Total revenues   $ 6,226,000,000 5,886,000,000 5,625,000,000    
Subscription agreement period   3 years        
Impairment of indefinite-lived intangible assets   $ 0 $ 0 0    
Stock split conversion ratio 3          
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01 $ 0.01      
Retained earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total equity   $ 7,207,000,000 $ 6,465,000,000 5,628,000,000   $ 5,027,000,000
Cumulative effect, period of adoption | Retained earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total equity           $ (12,000,000)
Anti-Financial Crime | Operating segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total revenues   306,000,000 231,000,000 116,000,000    
Market Platforms | Operating segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total revenues   4,225,000,000 4,048,000,000 4,179,000,000    
Capital Access Platforms | Operating segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total revenues   $ 1,684,000,000 1,568,000,000 1,287,000,000    
Listing services            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Renewal fee, recognition period   12 months        
Trade Management Services            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Renewal fee, recognition period   12 months        
Market Technology | Market Platforms | Marketplace Technology | Operating segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total revenues   $ 75,000,000 77,000,000 90,000,000    
Index | Capital Access Platforms            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of types of license agreements (in agreements) | company   2        
Accounting Standards Update 2016-13 | Cumulative effect, period of adoption | Retained earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total equity         $ 12,000,000  
Employee Stock Purchase Plan            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Percentage of fair market value of common stock   85.00%        
Percentage of discount to employees on purchase of common stock under employee stock purchase plant   15.00%        
Customer Relationships            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Intangible asset impairment charges   $ 0 14,000,000 $ 0    
Minimum            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Remaining lease term   2 years        
Revenue, remaining performance obligation, period   3 months        
Subscription agreement period   1 year        
Minimum | Listing services            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Revenue, remaining performance obligation, period   3 years        
Minimum | Technology            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of intangible assets   5 years        
Minimum | Building and Building Improvements            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of property and equipment   10 years        
Minimum | Data processing equipment and software            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of property and equipment   3 years        
Minimum | Furniture And Equipment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of property and equipment   5 years        
Maximum            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Remaining lease term   14 years        
Revenue, remaining performance obligation, period   3 years        
Subscription agreement period   3 years        
Maximum | Listing services            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Revenue, remaining performance obligation, period   6 years        
Maximum | Technology            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of intangible assets   10 years        
Maximum | Building and Building Improvements            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of property and equipment   40 years        
Maximum | Data processing equipment and software            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of property and equipment   5 years        
Maximum | Furniture And Equipment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life of property and equipment   10 years        
Cash Equivalents            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cash and cash equivalents   $ 242,000,000 $ 109,000,000