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Reserve for Property and Casualty Insurance Claims and Claims Expense - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2020
Jun. 30, 2019
Jun. 30, 2020
Jul. 24, 2020
Jun. 20, 2020
Dec. 31, 2019
Increase (decrease) in claims and claims expense            
Reserves for asbestos claims     $ 779     $ 810
Reinsurance recoverables for asbestos claims     (347)     (362)
Reserves for environmental claims     171     179
Reinsurance recoverables for environmental claims     (38)     $ (40)
Catastrophe            
Increase (decrease) in claims and claims expense            
Total incurred   $ (1,750) $ (1,400)      
Fire            
Increase (decrease) in claims and claims expense            
Catastrophe reinsurance settlement amount         $ 11,000  
Subsequent Event            
Increase (decrease) in claims and claims expense            
Reinsurance expected recovery, percentage       80.00%    
Minimum | Subsequent Event | Fire            
Increase (decrease) in claims and claims expense            
Total incurred $ 400          
Maximum | Subsequent Event | Fire            
Increase (decrease) in claims and claims expense            
Total incurred $ 450