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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Segment Reporting [Abstract] |
Schedule of Disclosure on Geographic Areas of Fixed Assets and Operating Lease Right-of-Use Asset | Consolidated long-lived assets, net by geographic area are as follows (in millions):
Years ended December 31 | Total |  | United States |  | Americas other than U.S. |  | United Kingdom |  | Europe, Middle East, & Africa |  | Asia Pacific
2019(1) | $ | 1,550 |  |  | $ | 686 |  |  | $ | 145 |  |  | $ | 225 |  |  | $ | 319 |  |  | $ | 175 |
2018 | $ | 588 |  |  | $ | 288 |  |  | $ | 44 |  |  | $ | 58 |  |  | $ | 101 |  |  | $ | 97 |
(1) In the first quarter of 2019, Aon adopted new accounting guidance related to the treatment of leases which was applied under the modified retrospective approach. Refer to Note 2 “Summary of Significant Accounting Principles and Practices” for further information.

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- Definition Tabular disclosure of the names of foreign countries in which material long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets are located, and amount of such long-lived assets located in that country or foreign geographic area. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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