v3.22.2.2
Document and Entity Information
Oct. 19, 2022
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0000315293
Document Type 8-K
Document Period End Date Oct. 19, 2022
Entity Registrant Name Aon plc
Entity Incorporation State Country Code L2
Entity File Number 1-7933
Entity Tax Identification Number 98-1539969
Entity Address, Address Line One Metropolitan Building
Entity Address, Address Line Two James Joyce Street
Entity Address, City or Town Dublin 1
Entity Address, Country IE
Entity Address, Postal Zip Code D01 K0Y8
City Area Code 353 1
Local Phone Number 266 6000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Capital Unit, Class A [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A Ordinary Shares, $0.01 nominal value
Trading Symbol AON
Security Exchange Name NYSE
Guarantees Of Aon Plcs 4.000 Senior Notes Due 2023 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 4.00% Senior Notes due 2023
Trading Symbol AON23
Security Exchange Name NYSE
Guarantees Of Aon Plcs 3.500 Senior Notes Due 2024 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 3.50% Senior Notes due 2024
Trading Symbol AON24
Security Exchange Name NYSE
Guarantees Of Aon Plcs 3.875 Senior Notes Due 2025 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 3.875% Senior Notes due 2025
Trading Symbol AON25
Security Exchange Name NYSE
Guarantees Of Aon Plcs 2.875 Senior Notes Due 2026 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 2.875% Senior Notes due 2026
Trading Symbol AON26
Security Exchange Name NYSE
Guarantees Of Aon Corporation And Aon Global Holdings Plcs 2.85 Senior Notes Due 20276 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.85% Senior Notes due 2027
Trading Symbol AON27
Security Exchange Name NYSE
Guarantees Of Aon Corporation And Aon Global Holdings Plcs 2.05 Senior Notes Due 20311 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.05% Senior Notes due 2031
Trading Symbol AON31
Security Exchange Name NYSE
Guarantees Of Aon Corporation And Aon Global Holdings Plcs 2.60 Senior Notes Due 20312 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.60% Senior Notes due 2031
Trading Symbol AON31A
Security Exchange Name NYSE
Guarantees Of Aon Corporation And Aon Global Holdings Plcs 5.00 Senior Notes Due 20323 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.00% Senior Notes due 2032
Trading Symbol AON32
Security Exchange Name NYSE
Guarantees Of Aon Plcs 4.250 Senior Notes Due 2042 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 4.25% Senior Notes due 2042
Trading Symbol AON42
Security Exchange Name NYSE
Guarantees Of Aon Plcs 4.450 Senior Notes Due 2043 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 4.45% Senior Notes due 2043
Trading Symbol AON43
Security Exchange Name NYSE
Guarantees Of Aon Plcs 4.600 Senior Notes Due 2044 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 4.60% Senior Notes due 2044
Trading Symbol AON44
Security Exchange Name NYSE
Guarantees Of Aon Plcs 4.750 Senior Notes Due 2045 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon plc’s 4.75% Senior Notes due 2045
Trading Symbol AON45
Security Exchange Name NYSE
Guarantees Of Aon Corporation And Aon Global Holdings Plcs 2.90 Senior Notes Due 20514 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.90% Senior Notes due 2051
Trading Symbol AON51
Security Exchange Name NYSE
Guarantees Of Aon Corporation And Aon Global Holdings Plcs 3.90 Senior Notes Due 20525 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Guarantees of Aon Corporation and Aon Global Holdings plc’s 3.90% Senior Notes due 2052
Trading Symbol AON52
Security Exchange Name NYSE