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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 |  |  |

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