Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2025 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Darren Zeidel [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On November 5, 2025, Darren Zeidel, Executive Vice President, General Counsel and Company Secretary, adopted a new Rule 10b5-1 trading plan intended to satisfy the affirmative defense in Rule 10b5-1(c). The plan’s maximum length is until February 2, 2027 and first trades were not permitted to occur until February 3, 2026, at the earliest. The plan is intended to permit Mr. Zeidel to sell 5,650 and 7,021 class A ordinary shares of Aon received pursuant to the vesting of certain equity awards, net of any shares withheld for taxes.
Name	Darren Zeidel
Title	Executive Vice President, General Counsel and Company Secretary
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 5, 2025
Expiration Date	February 2, 2027
Arrangement Duration	364 days
Transaction One [Member] | Darren Zeidel [Member]
Trading Arrangements, by Individual
Aggregate Available	5,650
Transaction Two [Member] | Darren Zeidel [Member]
Trading Arrangements, by Individual
Aggregate Available	7,021