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Claims, Lawsuits, and Other Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Sep. 06, 2018
USD ($)
Oct. 03, 2017
NZD ($)
Apr. 30, 2021
plaintiff
Aug. 31, 2020
USD ($)
plaintiff
Nov. 30, 2019
USD ($)
defendant
Nov. 30, 2018
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
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 $ 130,000,000             $ 130,000,000 $ 130,000,000   $ 113,000,000    
Letters of credit outstanding 76,000,000             76,000,000 76,000,000   $ 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 47,000,000             47,000,000 47,000,000        
Guarantor obligations, current carrying value 6,000,000             6,000,000 6,000,000        
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 78,000,000             78,000,000 78,000,000        
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 373,000,000   $ 528                    
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         $ 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 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 $ 800,000,000             $ 800,000,000 $ 800,000,000        
Maximum | Pilkington North America, Inc.                          
Legal, Guarantees and Indemnifications                          
Damages sought   85,000,000                      
Damages awarded   $ 15,000,000