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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Property, Liability and Casualty Insurance Product Line          
Product Information [Line Items]          
Reinsurance and other recoverables $ 5,083 $ 5,083 $ 3,780 $ 4,232 $ 3,957
Prior accident year development   (23) (139)    
Liability for Unpaid Claims and Claims Adjustment Expense, Net $ 22,814 22,814 20,017 $ 20,352 $ 19,818
Property, Liability and Casualty Insurance Product Line | Scenario, Adjustment [Member]          
Product Information [Line Items]          
Reinsurance and other recoverables     90    
Property, Liability and Casualty Insurance Product Line | Workers’ compensation          
Product Information [Line Items]          
Prior accident year development   (90) (97)    
Property, Liability and Casualty Insurance Product Line | Workers’ compensation discount accretion          
Product Information [Line Items]          
Prior accident year development   25 30    
Property, Liability and Casualty Insurance Product Line | General liability          
Product Information [Line Items]          
Prior accident year development   62 32    
Property, Liability and Casualty Insurance Product Line | Marine          
Product Information [Line Items]          
Prior accident year development   8 0    
Property, Liability and Casualty Insurance Product Line | Package business          
Product Information [Line Items]          
Prior accident year development   (32) (16)    
Property, Liability and Casualty Insurance Product Line | Professional liability          
Product Information [Line Items]          
Prior accident year development   32 (12)    
Property, Liability and Casualty Insurance Product Line | Bond          
Product Information [Line Items]          
Prior accident year development   (2) 0    
Property, Liability and Casualty Insurance Product Line | Assumed Reinsurance          
Product Information [Line Items]          
Prior accident year development   3 0    
Property, Liability and Casualty Insurance Product Line | Net asbestos reserves          
Product Information [Line Items]          
Prior accident year development   0 0    
Property, Liability and Casualty Insurance Product Line | Net environmental reserves          
Product Information [Line Items]          
Prior accident year development   0 0    
Property, Liability and Casualty Insurance Product Line | Catastrophes          
Product Information [Line Items]          
Prior accident year development   (27) (47)    
Property, Liability and Casualty Insurance Product Line | Catastrophes | Scenario, Adjustment [Member]          
Product Information [Line Items]          
Prior accident year development     133    
Liability for Unpaid Claims and Claims Adjustment Expense, Net     850    
Property, Liability and Casualty Insurance Product Line | Uncollectible reinsurance          
Product Information [Line Items]          
Prior accident year development   0 22    
Property, Liability and Casualty Insurance Product Line | Other reserve re-estimates, net          
Product Information [Line Items]          
Prior accident year development   15 4    
Property and Casualty, Commercial Insurance [Member] | Property          
Product Information [Line Items]          
Prior accident year development   (16) (10)    
Property and Casualty, Commercial Insurance [Member] | Automobile          
Product Information [Line Items]          
Prior accident year development   27 (15)    
Property and Casualty, Personal Insurance [Member] | Property          
Product Information [Line Items]          
Prior accident year development   0 (20)    
Property and Casualty, Personal Insurance [Member] | Automobile          
Product Information [Line Items]          
Prior accident year development   (28) $ (10)    
PG&E [Member]          
Gain Contingencies [Line Items]          
Percentage of Insurance Subrogation Claims Covered in Settlement 85.00%        
Reinsurance Recoverable, Guarantee Benefit $ 116 116      
PG&E [Member] | Expected Settlement for All Consenting Creditors [Member]          
Gain Contingencies [Line Items]          
Gain Contingency, Unrecorded Amount 11,000 11,000      
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member]          
Gain Contingencies [Line Items]          
Gain Contingency, Unrecorded Amount 325 325      
PG&E [Member] | Portion of Expected Class Settlement Due to Reinsurer [Member]          
Gain Contingencies [Line Items]          
Gain Contingency, Unrecorded Amount $ 116 $ 116