    <SEC-DOCUMENT>0001193125-20-093512-index.html : 20200401
    <SEC-HEADER>0001193125-20-093512.hdr.sgml : 20200401
    <ACCEPTANCE-DATETIME>20200401081419
    ACCESSION NUMBER:		0001193125-20-093512
    CONFORMED SUBMISSION TYPE:	8-K12B
    PUBLIC DOCUMENT COUNT:		29
    CONFORMED PERIOD OF REPORT:	20200401
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
    ITEM INFORMATION:		Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing
    ITEM INFORMATION:		Unregistered Sales of Equity Securities
    ITEM INFORMATION:		Material Modifications to Rights of Security Holders
    ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
    ITEM INFORMATION:		Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200401
    DATE AS OF CHANGE:		20200401

    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:		8-K12B
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-07933
    		FILM NUMBER:		20763780

    	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>8-K12B
    <SEQUENCE>1
    <FILENAME>d867242d8k12b.htm
    <DESCRIPTION>8-K12B
    <TEXT>
    Document 1 - file: d867242d8k12b.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-3.1
    <SEQUENCE>2
    <FILENAME>d867242dex31.htm
    <DESCRIPTION>EX-3.1
    <TEXT>
    Document 2 - file: d867242dex31.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.1
    <SEQUENCE>3
    <FILENAME>d867242dex41.htm
    <DESCRIPTION>EX-4.1
    <TEXT>
    Document 3 - file: d867242dex41.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.2
    <SEQUENCE>4
    <FILENAME>d867242dex42.htm
    <DESCRIPTION>EX-4.2
    <TEXT>
    Document 4 - file: d867242dex42.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.3
    <SEQUENCE>5
    <FILENAME>d867242dex43.htm
    <DESCRIPTION>EX-4.3
    <TEXT>
    Document 5 - file: d867242dex43.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.4
    <SEQUENCE>6
    <FILENAME>d867242dex44.htm
    <DESCRIPTION>EX-4.4
    <TEXT>
    Document 6 - file: d867242dex44.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.5
    <SEQUENCE>7
    <FILENAME>d867242dex45.htm
    <DESCRIPTION>EX-4.5
    <TEXT>
    Document 7 - file: d867242dex45.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.6
    <SEQUENCE>8
    <FILENAME>d867242dex46.htm
    <DESCRIPTION>EX-4.6
    <TEXT>
    Document 8 - file: d867242dex46.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.7
    <SEQUENCE>9
    <FILENAME>d867242dex47.htm
    <DESCRIPTION>EX-4.7
    <TEXT>
    Document 9 - file: d867242dex47.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>10
    <FILENAME>d867242dex101.htm
    <DESCRIPTION>EX-10.1
    <TEXT>
    Document 10 - file: d867242dex101.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.2
    <SEQUENCE>11
    <FILENAME>d867242dex102.htm
    <DESCRIPTION>EX-10.2
    <TEXT>
    Document 11 - file: d867242dex102.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.3
    <SEQUENCE>12
    <FILENAME>d867242dex103.htm
    <DESCRIPTION>EX-10.3
    <TEXT>
    Document 12 - file: d867242dex103.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.4
    <SEQUENCE>13
    <FILENAME>d867242dex104.htm
    <DESCRIPTION>EX-10.4
    <TEXT>
    Document 13 - file: d867242dex104.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>14
    <FILENAME>d867242dex991.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 14 - file: d867242dex991.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>15
    <FILENAME>aon-20200401.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 15 - file: aon-20200401.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>16
    <FILENAME>aon-20200401_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
    <TEXT>
    Document 16 - file: aon-20200401_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>17
    <FILENAME>aon-20200401_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 17 - file: aon-20200401_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>18
    <FILENAME>aon-20200401_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 18 - file: aon-20200401_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g867242exhibit99-1xu001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g867242exhibit99-1xu001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g867242g47x19.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g867242g47x19.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g867242g68a97.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g867242g68a97.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>22
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: FilingSummary.html

    Document 22 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>d867242d8k12b_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: d867242d8k12b_htm.html

    Document 23 - RAW XML: d867242d8k12b_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>25
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>26
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>27
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>28
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>29
    <FILENAME>0001193125-20-093512-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 29 - file: 0001193125-20-093512-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>