    <SEC-DOCUMENT>0001193125-21-117747-index.html : 20210415
    <SEC-HEADER>0001193125-21-117747.hdr.sgml : 20210415
    <ACCEPTANCE-DATETIME>20210415161007
    ACCESSION NUMBER:		0001193125-21-117747
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20210415
    DATE AS OF CHANGE:		20210415

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Aon plc
    		CENTRAL INDEX KEY:			0000315293
    		STANDARD INDUSTRIAL CLASSIFICATION:	INSURANCE AGENTS BROKERS & SERVICES [6411]
    		IRS NUMBER:				363051915
    		STATE OF INCORPORATION:			X0
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-07933
    		FILM NUMBER:		21828578

    	BUSINESS ADDRESS:
    		STREET 1:		THE LEADENHALL BUILDING
    		STREET 2:		122 LEADENHALL STREET
    		CITY:			LONDON
    		STATE:			X0
    		ZIP:			EC3V 4AN
    		BUSINESS PHONE:		(44) 20 7623 5500

    	MAIL ADDRESS:
    		STREET 1:		THE LEADENHALL BUILDING
    		STREET 2:		122 LEADENHALL STREET
    		CITY:			LONDON
    		STATE:			X0
    		ZIP:			EC3V 4AN

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	AON CORP
    		DATE OF NAME CHANGE:	19920703

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	COMBINED INTERNATIONAL CORP
    		DATE OF NAME CHANGE:	19870504
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>d125154ddefa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: d125154ddefa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>g125154g27e09.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: g125154g27e09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g125154g86j96.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g125154g86j96.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>