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Acquisitions and Dispositions of Businesses - Completed Acquisitions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 01, 2021
USD ($)
Jun. 30, 2022
acquisition
Jun. 30, 2021
acquisition
Jun. 30, 2022
acquisition
Jun. 30, 2021
acquisition
May 03, 2022
Dec. 22, 2021
Business Acquisition [Line Items]              
Number of business acquired under business combination | acquisition   1 0 2 0    
Karl Köllner Group              
Business Acquisition [Line Items]              
Percentage of capital acquired           100.00%  
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