XML 94 R29.htm IDEA: XBRL DOCUMENT
v3.20.1

Subsequent Events | 12 Months Ended
--- | ---
Dec. 31, 2019
Subsequent Events [Abstract] |
Subsequent Events [Text Block] | Subsequent Events Business Combination Agreement On March 9, 2020, the Company and Willis Towers Watson Public Limited Company, an Irish public limited company (“WTW”), entered into a business combination agreement with respect to a combination of the parties. At the effective date of the combination, WTW shareholders will be entitled to receive 1.08 newly issued Class A ordinary shares, nominal value $0.01 per share, of Aon Ireland in exchange for each ordinary share of WTW held by such holders. The combination is expected to be completed in the first half of 2021.

X
- References No definition available. + Details
Name: | us-gaap_SubsequentEventsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
Name: | us-gaap_SubsequentEventsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration