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Derivatives and Hedging Foreign Exchange Risk Management Narrative (Details) | 6 Months Ended
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Jun. 30, 2014
Not Designated as Hedging Instrument [Member] |
Derivative [Line Items] |
Foreign currency exposures, maximum hedging period | 1 year
Cash Flow Hedging [Member] |
Derivative [Line Items] |
Foreign currency exposures, maximum average hedging period | 2 years
Foreign currency exposures, maximum hedging period | 5 years
Net Investment Hedging [Member] |
Derivative [Line Items] |
Foreign currency exposures, maximum hedging period | 2 years

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- Definition Maximum average contract period for foreign currency exchange rate derivatives. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future exchange rates on its net investments in foreign operations. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future exchange rates using instruments not designated as accounting hedges. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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