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Network
2407404 - Disclosure - Goodwill and Other Intangible Assets - Schedule of estimated future amortization expense on intangible assets (Details)
(http://www.aon.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfEstimatedFutureAmortizationExpenseOnIntangibleAssetsDetails)
TableSchedule of Finite-Lived Intangible Assets [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000315293 (http://www.sec.gov/CIK)
Finite-Lived Intangible Assets [Line Items]Period [Axis]
2016-12-31
Segments [Axis]
Risk SolutionsHR SolutionsSegments [Domain]
2017
123,000,000  
136,000,000  
259,000,000  
2018
118,000,000  
91,000,000  
209,000,000  
2019
107,000,000  
73,000,000  
180,000,000  
2020
97,000,000  
61,000,000  
158,000,000  
2021
66,000,000  
53,000,000  
119,000,000  
Thereafter
239,000,000  
61,000,000  
300,000,000  
Total future amortization of intangible assets
750,000,000  
 
475,000,000  
 
1,225,000,000