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Accelerating Aon United Program - Schedule of Program Costs Incurred (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Charges	$ 32	$ 69	$ 236	$ 320
Accelerating Aon United Program
Restructuring Cost and Reserve [Line Items]
Charges	32	69	236	320
Accelerating Aon United Program \| Corporate
Restructuring Cost and Reserve [Line Items]
Charges	36	54	179	190
Risk Capital \| Accelerating Aon United Program \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges	(3)	11	48	103
Human Capital \| Accelerating Aon United Program \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges	$ (1)	$ 4	$ 9	$ 27

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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