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Reserve for Property and Casualty Insurance Claims and Claims Expense - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
settlement
Sep. 30, 2020
USD ($)
settlement
Sep. 30, 2019
USD ($)
Sep. 14, 2020
USD ($)
Jul. 24, 2020
Jun. 20, 2020
USD ($)
Dec. 31, 2019
USD ($)
Increase (decrease) in claims and claims expense                
Reserves for asbestos claims   $ 844 $ 844         $ 810
Reinsurance recoverables for asbestos claims   (396) (396)         (362)
Reserves for environmental claims   210 210         179
Reinsurance recoverables for environmental claims   $ (43) (43)         $ (40)
Prior years     (440) $ (118)        
Reinsurance expected recovery, percentage           80.00%    
Catastrophe                
Increase (decrease) in claims and claims expense                
Incurred expense (adjustment)     $ (2,390) (2,260)        
Number of settlements | settlement   2 2          
Prior years   $ (495) $ (502) $ 53        
PG&E | Fire                
Increase (decrease) in claims and claims expense                
Catastrophe reinsurance settlement amount             $ 11,000  
Prior years $ (450)              
Southern California Edison | Fire                
Increase (decrease) in claims and claims expense                
Catastrophe reinsurance settlement amount         $ 1,160      
Prior years   $ (45)