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Accelerating Aon United Program - Schedule of Program Costs Incurred (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Charges	$ 94	$ 132	$ 204	$ 251
Accelerating Aon United Program
Restructuring Cost and Reserve [Line Items]
Charges	94	132	204	251
Accelerating Aon United Program \| Corporate
Restructuring Cost and Reserve [Line Items]
Charges	56	71	143	136
Risk Capital \| Accelerating Aon United Program \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges	32	49	51	92
Human Capital \| Accelerating Aon United Program \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges	$ 6	$ 12	$ 10	$ 23

- 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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