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Acquisitions (Scientific Management Associates (Operations) Pty Ltd) (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 06, 2020 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 2,060 | $ 1,761 | $ 1,265
SMA |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price of acquisition | $ 13 |  |  |  |
Hold-backs to be settled and other adjustments | 4 |  |  |  |
Cash consideration paid | 9 |  |  |  |
Goodwill | $ 12 |  |  |  |
Payment of contingent consideration liability |  | $ 1 |  |  |

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