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Claims, Lawsuits, and Other Contingencies - Legal Narrative (Details)
£ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Sep. 06, 2018
USD ($)
Oct. 03, 2017
NZD ($)
Apr. 30, 2021
USD ($)
plaintiff
Apr. 30, 2021
GBP (£)
plaintiff
Aug. 31, 2020
USD ($)
plaintiff
Nov. 30, 2019
USD ($)
defendant
Nov. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Sep. 16, 2020
USD ($)
Apr. 27, 2018
USD ($)
Aviation and Aerospace Broking Industry                      
Legal, Guarantees and Indemnifications                      
Revenue                 $ 100,000,000    
Christchurch City Council | Pending Litigation                      
Legal, Guarantees and Indemnifications                      
Damages sought $ 223,000,000   $ 320                
Aon Hewitt Investment Consulting Inc                      
Legal, Guarantees and Indemnifications                      
Investment losses suffered by plaintiff                     $ 200,000,000
Fatal Plain Crash In November 2016 | Pending Litigation                      
Legal, Guarantees and Indemnifications                      
Damages sought       $ 38,000,000 £ 29 $ 844,000,000   $ 16,000,000      
Number of defendants | defendant             3        
Damages sought option 1             $ 300,000,000        
Damages sought option 2             50,000,000        
Damages sought option 3             $ 25,000,000        
Loss contingency, number of plaintiffs | plaintiff       16 16 43          
NEBC | Pending Litigation                      
Legal, Guarantees and Indemnifications                      
Investment losses suffered by plaintiff                   $ 2,000,000,000  
Minimum                      
Legal, Guarantees and Indemnifications                      
Estimate of possible loss 0                    
Minimum | Pilkington North America, Inc.                      
Legal, Guarantees and Indemnifications                      
Damages sought   $ 45,000,000                  
Maximum                      
Legal, Guarantees and Indemnifications                      
Estimate of possible loss $ 400,000,000                    
Maximum | Pilkington North America, Inc.                      
Legal, Guarantees and Indemnifications                      
Damages sought   85,000,000                  
Damages awarded   $ 15,000,000