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Acquisitions and Divestitures - Narrative (Details) shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Sep. 14, 2023 USD ($) | Sep. 05, 2023 USD ($) trading_day shares | Feb. 29, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from sale of Promissory Note |  |  |  |  |  | $ 75,000,000 | $ 0
Black Knight, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Note receivable, face amount |  | $ 500,000,000 |  |  |  |  |
Note receivable, term |  | 40 years |  |  |  |  |
Interest rate |  | 7.00% |  |  |  |  |
Note receivable | $ 75,000,000 | $ 235,000,000 |  |  |  |  |
Fair value, option, changes in fair value, loss | $ 160,000,000 |  |  |  |  |  |
Proceeds from sale of Promissory Note |  |  |  | $ 75,000,000 |  |  |
Optimal Blue | Black Knight, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  | $ 241,000,000 |  |  |  |  |
Black Knight, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 100.00% |  |  |  |
Total purchase price |  |  | $ 11,838,000,000 |  |  |  |
Cash |  |  | $ 10,542,000,000 |  |  |  |
Equity interests issued and issuable (in shares) | shares |  |  | 10.9 |  |  |  |
Business combination, common stock, consecutive trading days | trading_day |  |  | 10 |  |  |  |
Business combination, common stock, trading days prior to closing | trading_day |  |  | 3 |  |  |  |
Total net purchase price |  |  | $ 11,838,000,000 |  |  |  |
Expected tax deductible amount |  |  | $ 186,000,000 |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | $ 264,000,000 | 800,000,000 |
Business combination, pro forma information, operating expenses of acquire since acquisition date, actual |  |  |  |  | $ 287,000,000 | $ 850,000,000 |

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