XML 31 R37.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Cash and Cash Equivalents (Details) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 USD ($) | Mar. 31, 2014 GBP (£) | Dec. 31, 2013 USD ($)
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |  |
Short-term investment, minimum maturity period | 3 months | 3 months |
Short-term investment, maximum maturity period | 1 year | 1 year |
Operating funds in U.K. | $ 128 | £ 77 | $ 126
Cash and cash equivalents, restricted | $ 125 |  | $ 88

X
- Definition Represents cash that is restricted for minimum operating fund requirements. + References No definition available. + Details
Name: | aon_RestrictedCashOperatingFunds
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Short Term Investments Maturity Maximum Period + References No definition available. + Details
Name: | aon_ShortTermInvestmentsMaturityMaximumPeriod
Namespace Prefix: | aon_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short Term Investments Maturity Minimum Period + References No definition available. + Details
Name: | aon_ShortTermInvestmentsMaturityMinimumPeriod
Namespace Prefix: | aon_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant