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Acquisitions - Summary of Excess Purchase Price Over Estimated Fair Value of Net Assets Acquired (Details) - USD ($) $ in Millions | Nov. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Business Acquisition [Line Items] |  |  |  |
Excess purchase price over estimated fair value of net assets acquired |  | $ 5,129 | $ 4,868 | $ 4,995
Turner & Townsend |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price | $ 1,217 |  |  |
Less: Estimated fair value of net assets acquired | 152 |  |  |
Plus: Estimated fair value of non-controlling interest | 32 |  |  |
Excess purchase price over estimated fair value of net assets acquired | $ 1,097 |  |  |

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