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Acquisitions and Divestitures - Schedule of Key Components of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions | $ 59 | $ (70) | $ 1,898
Held for sale or disposed |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Operating (loss) profit | (1) | 22 | 82
Sale |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions | 59 |  |
Sale | PrimeOne |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions | 38 |  |
Sale | Fincentric |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions | $ 21 |  |
Sale | Engineering Solutions Business |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions |  | $ (120) |
Sale | Leveraged Commentary and Data |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions |  |  | 505
Sale | Leveraged Loan Indices |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions |  |  | 52
Sale | CUSIP Global Services |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Pre-tax gain (loss) on dispositions |  |  | $ 1,342

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