Nature of Operations (Details) colleague in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) colleague country	Mar. 31, 2019 USD ($)
Nature of Operations [Line Items]
Entity number of colleagues \| colleague	76
Revenue	$ 4,651	$ 4,071
Number of countries in which entity operates (more than) \| country	130
Support fund	$ 5
Marsh & McLennan Companies, Inc.
Nature of Operations [Line Items]
Revenue	$ 17,000

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration