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Earnings/(Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Earnings/(Loss) Per Share | Basic and diluted earnings/(loss) per share are as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Net income/(loss) attributable to WTW |  | $ | 304 |  |  | $ | (1,675 | ) |  | $ | 870 |  |  | $ | (1,344 | )
Basic average number of shares outstanding |  |  | 98 |  |  |  | 102 |  |  |  | 99 |  |  |  | 103 |
Dilutive effect of potentially issuable shares |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |
Diluted average number of shares outstanding |  |  | 98 |  |  |  | 102 |  |  |  | 100 |  |  |  | 103 |
Basic earnings/(loss) per share |  | $ | 3.12 |  |  | $ | (16.44 | ) |  | $ | 8.80 |  |  | $ | (13.11 | )
Dilutive effect of potentially issuable shares |  |  | (0.01 | ) |  |  | — |  |  |  | (0.06 | ) |  |  | — |
Diluted earnings/(loss) per share |  | $ | 3.11 |  |  | $ | (16.44 | ) |  | $ | 8.74 |  |  | $ | (13.11 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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