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Acquisitions and Dispositions of Businesses - Completed Acquisitions (Details)
$ in Millions
3 Months Ended
Sep. 01, 2021
USD ($)
Mar. 31, 2022
acquisition
Mar. 31, 2021
acquisition
Dec. 22, 2021
Business Acquisition [Line Items]        
Number of business acquired under business combination | acquisition   1 0  
For Welfare S.r.l        
Business Acquisition [Line Items]        
Percentage of capital acquired       100.00%
Aon India Insurance Brokers Limited        
Business Acquisition [Line Items]        
Percentage of capital acquired 51.00%      
Equity interest in acquiree, percentage 49.00%      
Equity interest in acquiree | $ $ 15