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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Change in deferred gain on retroactive reinsurance included in other liabilities [1] $ 29 $ 0
Camp Wildfire [Member]    
Gain Contingencies [Line Items]    
Salvage and Subrogation Recoveries, Value 57  
Unrecorded estimated litigation settlement, amount due to reinsurer 57  
Per occurrence retention [Member] | Camp Wildfire [Member]    
Gain Contingencies [Line Items]    
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments 12  
Reinsurance Retention Policy, Amount Retained 350  
Aggregate excess of loss treaty [Member] | Camp Wildfire [Member]    
Gain Contingencies [Line Items]    
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments 45  
Reinsurance Retention Policy, Amount Retained 825  
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] | Minimum    
Gain Contingencies [Line Items]    
Gain Contingency, Unrecorded Amount 300  
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] | Maximum    
Gain Contingencies [Line Items]    
Gain Contingency, Unrecorded Amount 325  
Workers’ compensation    
Prior accident year development [1] (17) (20)
Workers’ compensation discount accretion    
Prior accident year development [1] 9 8
General Liability [Member]    
Prior accident year development [1] 12 6
Marine    
Prior accident year development [1] 0 0
Package business    
Prior accident year development [1] 1 5
Property    
Prior accident year development [1] (2) 1
Property | Property and Casualty, Commercial Insurance [Member]    
Prior accident year development [1] (7) (2)
Professional liability    
Prior accident year development [1] 1 0
Bond    
Prior accident year development [1] 0 0
Assumed reinsurance    
Prior accident year development [1] 0 0
Automobile | Property and Casualty, Commercial Insurance [Member]    
Prior accident year development [1] 5 0
Automobile | Property and Casualty, Personal Insurance [Member]    
Prior accident year development [1] (6) (5)
Net asbestos reserves    
Prior accident year development [1] 0 0
Net environmental reserves    
Prior accident year development [1] 0 0
Catastrophes [Member]    
Prior accident year development [1] (13) (8)
Uncollectible reinsurance    
Prior accident year development [1] 0 0
Other reserve re-estimates, net    
Prior accident year development [1] 11 4
Property, Liability and Casualty Insurance Product Line    
Prior accident year development [1] 23 (11)
Prior accident year development before change in deferred gain $ (6) $ (11)