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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Number of options vested.

+ References

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-SubTopic 10
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-Section 50
-Paragraph 4
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-4

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Acquisitions - Narrative (Details) shares in Thousands, £ in Millions, $ in Millions					1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2026 USD ($)	Apr. 30, 2026 GBP (£)	Jan. 27, 2026 USD ($) shares	May 02, 2025 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2026 shares	Mar. 31, 2026 shares	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($)
Business Combination [Line Items]
Acquisition,contingent consideration								$ 6
Acquisitions, cash payment								23	$ 8
Preliminary values of intangible assets								409
Customer Relationships [Member]
Business Combination [Line Items]
Preliminary values of intangible assets								$ 271
Restricted Stock Units [Member]
Business Combination [Line Items]
Number of shares issued \| shares								1,112
Newfront Insurance Holdings, Inc
Business Combination [Line Items]
Acquisitions, cash payment			$ 900
Acquisiiton , equity payment			150
Newfront Insurance Holdings, Inc \| Customer Relationships [Member]
Business Combination [Line Items]
Preliminary values of intangible assets			$ 209
Weighted-average expected lives of intangible assets			13 years
Newfront Insurance Holdings, Inc \| Developed Software [Member]
Business Combination [Line Items]
Preliminary values of intangible assets			$ 55
Weighted-average expected lives of intangible assets			7 years
Newfront Insurance Holdings, Inc \| Performance Targets
Business Combination [Line Items]
Contingent consideration, amount			$ 250
Newfront Insurance Holdings, Inc \| Restricted Stock Units [Member]
Business Combination [Line Items]
Number of shares issued \| shares			187,000			3,000		187
Newfront Insurance Holdings, Inc \| Restricted Stock Awards [Member]
Business Combination [Line Items]
Number of shares issued \| shares			225
Number of ordinary shares vested \| shares						26	199
Newfront Insurance Holdings, Inc \| Senior Notes
Business Combination [Line Items]
Proceeds from debt, net of issuance costs					$ 1,000
Newfront Insurance Holdings, Inc \| Up-Front
Business Combination [Line Items]
Contingent consideration fair value			$ 1,050
Pending Acquisitions \| Al-Futtaim Willis
Business Combination [Line Items]
Acquisitions, cash payment				$ 58
Reamining controlling interest				51.00%
Cushon Acquisition
Business Combination [Line Items]
Acquisitions, cash payment \| £		£ 150
Contingent consideration, amount \| £		£ 100
Cushon Acquisition \| Customer Relationships [Member]
Business Combination [Line Items]
Preliminary values of intangible assets	$ 58
Weighted-average expected lives of intangible assets	20 years	20 years
Cushon Acquisition \| Developed Software [Member]
Business Combination [Line Items]
Preliminary values of intangible assets	$ 49
Weighted-average expected lives of intangible assets	5 years	5 years
Cushon Acquisition \| Trade Names [Member]
Business Combination [Line Items]
Preliminary values of intangible assets	$ 4
Weighted-average expected lives of intangible assets	10 years	10 years
Other [Member]
Business Combination [Line Items]
Acquisitions, cash payment								$ 42
Equity Based Payment \| Newfront Insurance Holdings, Inc \| Above Target Performance
Business Combination [Line Items]
Contingent consideration, amount			$ 150