XML 194 R131.htm IDEA: XBRL DOCUMENT v3.20.4
Commitments and Contingencies - Commitments and Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended 19 Months Ended 48 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
Dec. 31, 2020
Dec. 31, 2020
Jan. 01, 2020
Loss Contingencies [Line Items]            
Other Commitment $ 1,119     $ 1,119 $ 1,119  
Premium tax offsets 0 $ 2   0 0  
Fair value of derivative instrument in a net liability position 86     86 86  
Collateral already posted 90     90 90  
Additional collateral required 2     2 2  
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability 83 $ 89        
Net asbestos reserves            
Loss Contingencies [Line Items]            
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts 702     702 702  
Net environmental reserves            
Loss Contingencies [Line Items]            
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts 87     87 87  
Asbestos and Environmental            
Loss Contingencies [Line Items]            
Reinsurance Retention Policy, Excess Retention, Amount Reinsured $ 640          
Reinsurance Retention Policy, Amount Retained     $ 1,700      
Adverse development from comprehensive annual review       220 860  
Other liabilities | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings            
Loss Contingencies [Line Items]            
Off-Balance Sheet, Credit Loss, Liability           $ 25
Insurance-related Assessments [Member]            
Loss Contingencies [Line Items]            
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund 1.00%          
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund 2.00%          
Limited partnerships and other alternative investments            
Loss Contingencies [Line Items]            
Other Commitment $ 804     804 804  
Private Placement Securities            
Loss Contingencies [Line Items]            
Other Commitment 79     79 79  
Mortgage loans            
Loss Contingencies [Line Items]            
Other Commitment 236     236 236  
Cancelable mortgage loan [Member]            
Loss Contingencies [Line Items]            
Other Commitment $ 149     $ 149 $ 149