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Accelerating Aon United Program - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Charges	$ 69	$ 6	$ 320	$ 6
Accelerating Aon United Program
Restructuring Cost and Reserve [Line Items]
Restructuring plan, period		3 years
Expected cost	1,000		1,000
Expected cost, cash charges	900		900
Expected cost, non-cash charges	100		100
Charges	$ 69		$ 320

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