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Acquisitions and Dispositions (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2023 | Jul. 25, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |
Tax expense |  |  | $ 153 | $ 124 |
Disposal Group, Disposed of by Sale | Financial Reconciliation Business |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net proceeds from sale of businesses and other assets |  | $ 235 |  |  |
Gain (loss) on disposition of business |  |  |  |  | $ 172
Tax expense |  |  |  |  | 48
Disposal group, including discontinued operation, goodwill |  |  |  |  | 38
Disposal group, including discontinued operation, trade receivable and capitalized software |  |  |  |  | 15
Disposal group, including discontinued operation, accumulated foreign currency translation loss |  |  |  |  | $ 10
Skytef and Sled |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments for acquisitions of businesses | $ 17 |  |  |  |

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