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Reinsurance and Indemnification - Catastrophe reinsurance (Details) - 12 months ended Dec. 31, 2022
$ in Millions, $ in Millions
USD ($)
reinstatement
contract
CAD ($)
reinstatement
contract
Contract Two | Minimum    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 3,750  
Contract Two | Maximum    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement 5,940  
Contract Three | Minimum    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement 5,940  
Contract Three | Maximum    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement 6,610  
Traditional Market, Placement One    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement 640  
Exhausting loss from catastrophes 3,750  
Traditional Market, Placement One | Contract Two    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 175  
Number of reinstatements each year for each contract | reinstatement 0 0
Traditional Market, Placement One | Contract Three    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 465  
Catastrophe Reinsurance Program    
Ceded Credit Risk [Line Items]    
Catastrophe reinsurance loss amount 2,500  
Catastrophe reinsurance aggregate loss limit 7,010  
Retention amount for catastrophe reinsurance agreement contracts 500  
Catastrophe Reinsurance Program | Traditional Market Member    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement 3,890  
Catastrophe Reinsurance Program | Traditional Market, Placement One    
Ceded Credit Risk [Line Items]    
Loss from catastrophes 3,560  
Exhausting loss from catastrophes $ 500  
Percentage of co-participation 5.00% 5.00%
Catastrophe Reinsurance Program | Traditional Market, Placement One | Contract Four    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 250  
Contracts number | contract 4 4
Number of reinstatements each year for each contract | reinstatement 1 1
Catastrophe annual reinstatement of limits, percentage 31.70% 31.70%
Catastrophe annual reinstatement of limits $ 500  
Term of catastrophe reinsurance agreement contract 1 year 1 year
Catastrophe Reinsurance Program | Traditional Market, Placement One | Contract Three    
Ceded Credit Risk [Line Items]    
Number of reinstatements each year for each contract | reinstatement 0 0
Catastrophe Reinsurance Program | Traditional Market, Placement Two    
Ceded Credit Risk [Line Items]    
Retention amount for catastrophe reinsurance agreement contracts $ 3,750  
Loss from catastrophes $ 331  
Percentage of co-participation 5.00% 5.00%
Number of reinstatements each year for each contract | reinstatement 1 1
Catastrophe Reinsurance Program | Traditional Market, Placement Two | Contract Two    
Ceded Credit Risk [Line Items]    
Contracts number | contract 2 2
Term of catastrophe reinsurance agreement contract 8 years 8 years
Catastrophe Reinsurance Program | Insurance Linked Securities (ILS)    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 1,550  
Catastrophe Reinsurance Program | Insurance Linked Securities (ILS) | Five Contracts    
Ceded Credit Risk [Line Items]    
Reinsurance ceded amount 950  
Catastrophe Reinsurance Program | Insurance Linked Securities (ILS) | Contract Three    
Ceded Credit Risk [Line Items]    
Reinsurance ceded amount 425  
Catastrophe Reinsurance Program | Insurance Linked Securities (ILS) | Contract One    
Ceded Credit Risk [Line Items]    
Reinsurance ceded amount $ 175  
Catastrophe Reinsurance Program | Canada Catastrophe Excess of Loss    
Ceded Credit Risk [Line Items]    
Retention amount for catastrophe reinsurance agreement contracts   $ 50
Loss from catastrophes   $ 175
Number of reinstatements each year for each contract | reinstatement 1 1
Kentucky Agreement    
Ceded Credit Risk [Line Items]    
Retention amount for catastrophe reinsurance agreement contracts $ 2  
Limit of aggregate losses under aggregate excess agreement $ 28  
Term of catastrophe reinsurance agreement contract 3 years 3 years
Retention percentage of reinsurance limit 95.00% 95.00%
Florida Hurricane Catastrophe Fund    
Ceded Credit Risk [Line Items]    
Catastrophe reinsurance aggregate loss limit $ 1,830  
Retention amount for catastrophe reinsurance agreement contracts $ 40  
Contracts number | contract 2 2
Reinsurance ceded amount $ 350  
Florida Hurricane Catastrophe Fund | Florida Hurricane Catastrophe Fund, Contract Two    
Ceded Credit Risk [Line Items]    
Retention percentage of reinsurance limit 90.00% 90.00%
Florida Hurricane Catastrophe Fund | Florida Hurricane Catastrophe Fund, Contract One    
Ceded Credit Risk [Line Items]    
Retention percentage of reinsurance limit 90.00% 90.00%
Florida Hurricane Catastrophe Fund | Traditional Market, Placement One    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 1,300  
Florida Hurricane Catastrophe Fund | Insurance Linked Securities (ILS)    
Ceded Credit Risk [Line Items]    
Limit of aggregate losses under aggregate excess agreement $ 488