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Claims, Lawsuits, and Other Contingencies (Details)
£ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
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 ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2020
USD ($)
Sep. 16, 2020
USD ($)
Apr. 27, 2018
USD ($)
Legal, Guarantees and Indemnifications                            
Maximum potential funding under commitments $ 105,000,000               $ 105,000,000 $ 105,000,000   $ 113,000,000    
Letters of credit outstanding 74,000,000               74,000,000 74,000,000   $ 79,000,000    
Aviation and Aerospace Broking Industry                            
Legal, Guarantees and Indemnifications                            
Revenue                     $ 100,000,000      
Discontinued Operations, Disposed of by Sale | Property Lease Guarantee | Tempo Business                            
Legal, Guarantees and Indemnifications                            
Maximum potential funding under commitments 43,000,000               43,000,000 43,000,000        
Guarantor obligations, current carrying value 5,000,000               5,000,000 5,000,000        
Loss contingency accrual payments                 0 0        
Discontinued Operations, Disposed of by Sale | Performance Guarantee | Tempo Business                            
Legal, Guarantees and Indemnifications                            
Maximum potential funding under commitments 65,000,000               65,000,000 65,000,000        
Guarantor obligations, current carrying value 1,000,000               1,000,000 1,000,000        
Loss contingency accrual payments                 0 0        
Christchurch City Council | Pending Litigation                            
Legal, Guarantees and Indemnifications                            
Damages sought 224,000,000   $ 320                      
Aon Hewitt Investment Consulting Inc                            
Legal, Guarantees and Indemnifications                            
Investment losses suffered by plaintiff (minimum)                           $ 200,000,000
Fatal Plain Crash In November 2016 | Pending Litigation                            
Legal, Guarantees and Indemnifications                            
Damages sought       $ 40,000,000 £ 29 $ 844,000,000   $ 15,500,000            
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 (minimum)                         $ 2,000,000,000  
Minimum                            
Legal, Guarantees and Indemnifications                            
Estimate of possible loss 0               0 0        
Minimum | Pilkington North America, Inc.                            
Legal, Guarantees and Indemnifications                            
Damages sought   $ 45,000,000                        
Maximum                            
Legal, Guarantees and Indemnifications                            
Estimate of possible loss $ 700,000,000               $ 700,000,000 $ 700,000,000        
Maximum | Pilkington North America, Inc.                            
Legal, Guarantees and Indemnifications                            
Damages sought   85,000,000                        
Damages awarded   $ 15,000,000