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Lease Commitments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 sqft
Leases, Operating [Abstract] |  |  |  |
Area of real estate property |  |  |  | 190,000 us-gaap_AreaOfRealEstateProperty
Rental expenses for operating leases |  |  |  |
Rental expense | $ 455 us-gaap_LeaseAndRentalExpense | $ 520 us-gaap_LeaseAndRentalExpense | $ 536 us-gaap_LeaseAndRentalExpense |
Sub lease rental income | 75 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | 77 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | 72 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 |
Net rental expense | 380 us-gaap_OperatingLeasesRentExpenseNet | 443 us-gaap_OperatingLeasesRentExpenseNet | 464 us-gaap_OperatingLeasesRentExpenseNet |
Future minimum rental payments under operating leases |  |  |  |
2015 | 362 aon_OperatingLeasesFutureMinimumPaymentsDueNetOfSubleaseRentalIncomeCurrent |  |  |
2016 | 333 aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInTwoYears |  |  |
2017 | 297 aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueInThreeYears |  |  |
2018 | 270 aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueInFourYears |  |  |
2019 | 240 aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueInFiveYears |  |  |
Thereafter | 876 aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueThereafter |  |  |
Total minimum payments required | $ 2,378 aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDue |  |  |

X
- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date, net of sublease rental income, relating to leases defined as operating. + References No definition available. + Details
Name: | aon_OperatingLeasesFutureMinimumPaymentsDueNetOfSubleaseRentalIncomeCurrent
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
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X
- Definition The total of future contractually required payments, net of sublease rental income, on leases defined as operating. + References No definition available. + Details
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- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments, net of sublease rental income, due within the fifth year of the balance sheet date relating to leases defined as operating. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments, net of sublease rental income, due within the fifth year of the balance sheet date relating to leases defined as operating. + References No definition available. + Details
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X
- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments, net of sublease rental income due within the third year of the balance sheet date relating to leases defined as operating. + References No definition available. + Details
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X
- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments, net of sublease rental income, due after the fifth year from the balance sheet date on leases defined as operating. + References No definition available. + Details
Name: | aon_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalIncomeDueThereafter
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X
- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments, net of sublease rental income, due within the second year of the balance sheet date relating to leases defined as operating. + References No definition available. + Details
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X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
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- Details
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- Details
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X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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