Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions |
Total |
Shares outstanding [Member] |
Ordinary shares and APIC [Member] |
Retained earnings [Member] |
AOCL [Member] |
[1] | Total WTW shareholders' equity [Member] |
Non-controlling interests [Member] |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Equity, beginning balance at Dec. 31, 2024 | $ 8,017 | $ 10,989 | $ 109 | $ (3,158) | $ 7,940 | $ 77 | ||||||
| Equity, beginning balance (in shares) at Dec. 31, 2024 | 99,806,000 | |||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||||||
| Shares repurchased | (200) | (200) | (200) | |||||||||
| Shares repurchased (in shares) | (607,000) | |||||||||||
| Net income | 239 | 235 | 235 | 4 | ||||||||
| Dividends declared | (93) | (93) | (93) | |||||||||
| Other comprehensive income (loss) | 223 | 223 | 223 | |||||||||
| Issuance of shares under employee stock compensation plans (in shares) | 12,000 | |||||||||||
| Share-based compensation and net settlements | 33 | 33 | 33 | |||||||||
| Foreign currency translation | (5) | (5) | (5) | |||||||||
| Equity, ending balance at Mar. 31, 2025 | 8,214 | 11,017 | 51 | (2,935) | 8,133 | 81 | ||||||
| Equity, ending balance (in shares) at Mar. 31, 2025 | 99,211,000 | |||||||||||
| Equity, beginning balance at Dec. 31, 2025 | 8,052 | 11,106 | (296) | (2,834) | 7,976 | 76 | ||||||
| Equity, beginning balance (in shares) at Dec. 31, 2025 | 95,080,000 | |||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||||||
| Shares repurchased | (300) | (300) | (300) | |||||||||
| Shares repurchased (in shares) | (1,014,000) | |||||||||||
| Net income | 303 | 297 | 297 | 6 | ||||||||
| Dividends declared | (93) | (93) | (93) | |||||||||
| Other comprehensive income (loss) | $ (36) | (36) | (36) | |||||||||
| Issuance of shares under employee stock compensation plans (in shares) | 13,000 | 13,000 | ||||||||||
| Acquisition of Newfront | [2] | $ 93 | 93 | 93 | ||||||||
| Acquisition of Newfront (in shares) | [2] | 199,000 | ||||||||||
| Share-based compensation and net settlements | 38 | 38 | 38 | |||||||||
| Foreign currency translation | 2 | 2 | 2 | |||||||||
| Equity, ending balance at Mar. 31, 2026 | $ 8,059 | $ 11,239 | $ (392) | $ (2,870) | $ 7,977 | $ 82 | ||||||
| Equity, ending balance (in shares) at Mar. 31, 2026 | 94,278,000 | |||||||||||
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| X | ||||||||||
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued which are neither cancelled nor held in the treasury. No definition available.
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Value of stock issued pursuant to acquisitions during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Adjustments to additional paid in capital, foreign currency translation gain (loss). No definition available.
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| X | ||||||||||
- Definition Adjustments to additional paid in capital, sharebased compensation and net settlements. No definition available.
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| X | ||||||||||
- Definition Other comprehensive income (loss), net of tax including portion attributable to nonredeemable noncontrolling interest. No definition available.
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