Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Title of 12(b) Security Title of 12(b) Security Guarantees of Aon North America, Inc.'s 5.750% Senior Notes due 2054 Guarantees of Aon North America, Inc.'s 5.750% Senior Notes due 2054 [Member] Guarantees of Aon North America, Inc.'s 5.750% Senior Notes due 2054 Class of Stock [Domain] Class of Stock [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.450% Senior Notes due 2046 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.450% Senior Notes due 2046 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.450% Senior Notes due 2046 Guarantees of Aon North America, Inc.'s 5.150% Senior Notes due 2029 Guarantees of Aon North America, Inc.'s 5.150% Senior Notes due 2029 [Member] Guarantees of Aon North America, Inc.'s 5.150% Senior Notes due 2029 Document Period End Date Document Period End Date Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.100% Senior Notes due 2038 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.100% Senior Notes due 2038 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.100% Senior Notes due 2038 Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Guarantees of Aon plc’s 4.250% Senior Notes due 2042 Guarantees of Aon plc’s 4.250% Senior Notes due 2042 [Member] Guarantees of Aon plc’s 4.250% Senior Notes due 2042 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.350% Senior Notes due 2029 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.350% Senior Notes due 2029 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.350% Senior Notes due 2029 Security Exchange Name Security Exchange Name Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.850% Senior Notes due 2027 Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.850% Senior Notes due 2027 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.850% Senior Notes due 2027 Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.900% Senior Notes due 2051 Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.900% Senior Notes due 2051 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.900% Senior Notes due 2051 Document Type Document Type Pre-commencement Tender Offer Pre-commencement Tender Offer Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.000% Senior Notes due 2032 Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.000% Senior Notes due 2032 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.000% Senior Notes due 2032 Entity Central Index Key Entity Central Index Key Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.800% Senior Notes due 2033 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.800% Senior Notes due 2033 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.800% Senior Notes due 2033 Cover [Abstract] Local Phone Number Local Phone Number Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.625% Senior Notes due 2031 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.625% Senior Notes due 2031 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.625% Senior Notes due 2031 Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.600% Senior Notes due 2031 Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.600% Senior Notes due 2031 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.600% Senior Notes due 2031 Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Written Communications Written Communications Trading Symbol Trading Symbol Guarantees of Aon North America, Inc.'s 5.450% Senior Notes due 2034 Guarantees of Aon North America, Inc.'s 5.450% Senior Notes due 2034 [Member] Guarantees of Aon North America, Inc.'s 5.450% Senior Notes due 2034 Guarantees of Aon North America, Inc.'s 5.125% Senior Notes due 2027 Guarantees of Aon North America, Inc.'s 5.125% Senior Notes due 2027 [Member] Guarantees of Aon North America, Inc.'s 5.125% Senior Notes due 2027 Guarantees of Aon Corporation and Aon Global Holdings plc’s 3.900% Senior Notes due 2052 Guarantees of Aon Corporation and Aon Global Holdings plc’s 3.90% Senior Notes due 2052 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc’s 3.90% Senior Notes due 2052 City Area Code City Area Code Document Information [Table] Document Information [Table] Guarantees of Aon Corporation and Aon Global Holdings plc's 5.350% Senior Notes due 2033 Guarantees of Aon Corporation and Aon Global Holdings plc's 5.350% Senior Notes due 2033 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc's 5.350% Senior Notes due 2033 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.950% Senior Notes due 2036 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.950% Senior Notes due 2036 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 5.950% Senior Notes due 2036 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.450% Senior Notes due 2056 Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.450% Senior Notes due 2056 [Member] Guarantees of Aon North America, Inc. and Aon Global Holdings plc’s 6.450% Senior Notes due 2056 Entity Address, City or Town Entity Address, City or Town Guarantees of Aon plc’s 4.750% Senior Notes due 2045 Guarantees of Aon plc’s 4.750% Senior Notes due 2045 [Member] Guarantees of Aon plc’s 4.750% Senior Notes due 2045 Guarantees of Aon North America, Inc.'s 5.300% Senior Notes due 2031 Guarantees of Aon North America, Inc.'s 5.300% Senior Notes due 2031 [Member] Guarantees of Aon North America, Inc.'s 5.300% Senior Notes due 2031 Entity Address, Country Entity Address, Country Class A Ordinary Shares $0.01 nominal value Capital Unit, Class A [Member] Guarantees of Aon plc’s 4.450% Senior Notes due 2043 Guarantees of Aon plc’s 4.450% Senior Notes due 2043 [Member] Guarantees of Aon plc’s 4.450% Senior Notes due 2043 Guarantees of Aon plc’s 4.600% Senior Notes due 2044 Guarantees of Aon plc’s 4.600% Senior Notes due 2044 [Member] Guarantees of Aon plc’s 4.600% Senior Notes due 2044 Document Information [Line Items] Document Information [Line Items] Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.050% Senior Notes due 2031 Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.050% Senior Notes due 2031 [Member] Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.050% Senior Notes due 2031 Class of Stock [Axis] Class of Stock [Axis] Entity Emerging Growth Company Entity Emerging Growth Company