v2.3.0.15

Cash and Cash Equivalents | 9 Months Ended
--- | ---
Sep. 30, 2011
Cash and Cash Equivalents. |
Cash and Cash Equivalents |
3. Cash and Cash Equivalents Cash and cash equivalents include cash balances and all highly liquid investments with initial maturities of three months or less. Cash and cash equivalents included restricted balances of $183 million and $60 million at September 30, 2011 and December 31, 2010, respectively. The increase in the restricted balances is primarily due to a requirement for the Company to hold approximately $123 million of operating funds in the U.K.

X
- Details
Name: | aon_CashAndCashEquivalentsDisclosureAbstract
Namespace Prefix: | aon
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Separate disclosure of the cash and cash items which are restricted as to withdrawal or usage. The provisions of any restrictions shall be described in a note to the financial statements. 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock
Namespace Prefix: | us-gaap
Data Type: | us-types:textBlockItemType
Balance Type: | na
Period Type: | duration