    <SEC-DOCUMENT>0001193125-20-139877-index.html : 20200512
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    <ACCEPTANCE-DATETIME>20200512105026
    ACCESSION NUMBER:		0001193125-20-139877
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		20
    CONFORMED PERIOD OF REPORT:	20200512
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200512
    DATE AS OF CHANGE:		20200512

    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-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-07933
    		FILM NUMBER:		20867140

    	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
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    <SEQUENCE>1
    <FILENAME>d925767d8k.htm
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    Document 1 - file: d925767d8k.htm

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    <DESCRIPTION>EX-99.1
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    <DESCRIPTION>EX-99.2
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    <DESCRIPTION>EX-99.3
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    <SEQUENCE>6
    <FILENAME>d925767dex994.htm
    <DESCRIPTION>EX-99.4
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    <SEQUENCE>7
    <FILENAME>d925767dex995.htm
    <DESCRIPTION>EX-99.5
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    <FILENAME>d925767dex996.htm
    <DESCRIPTION>EX-99.6
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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>9
    <FILENAME>aon-20200512.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 9 - file: aon-20200512.xsd

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    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>10
    <FILENAME>aon-20200512_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
    <TEXT>
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    <TYPE>EX-101.LAB
    <SEQUENCE>11
    <FILENAME>aon-20200512_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 11 - file: aon-20200512_lab.xml

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    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>12
    <FILENAME>aon-20200512_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 12 - file: aon-20200512_pre.xml

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>d925767d8k_htm.xml
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    <TEXT>
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    Document 13 - RAW XML: d925767d8k_htm.xml

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    <SEQUENCE>14
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    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>R1.htm
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    <TEXT>
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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>16
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: Financial_Report.xlsx

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    <TYPE>JSON
    <SEQUENCE>18
    <FILENAME>MetaLinks.json
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    <TEXT>
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    <SEQUENCE>19
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    <TYPE>ZIP
    <SEQUENCE>20
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    <TEXT>
    Document 20 - file: 0001193125-20-139877-xbrl.zip

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>21
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: report.css

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