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Reinsurance and Indemnification - Catastrophe reinsurance (Narrative) (Details) - Catastrophe Reinsurance Program
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
contract
Contract
reinstatement
Ceded Credit Risk [Line Items]  
Catastrophe reinsurance loss amount $ 3,100
Catastrophe reinsurance aggregate loss limit 9,510
Two Contracts  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement 56
Maximum  
Ceded Credit Risk [Line Items]  
Retention amount for catastrophe reinsurance agreement contracts 1,000
Traditional Market, Placement One  
Ceded Credit Risk [Line Items]  
Catastrophe reinsurance aggregate loss limit 500
Retention amount for catastrophe reinsurance agreement contracts 56
Catastrophe loss events in excess of a deductible 50
Traditional Market  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement 6,080
Traditional Market | Coverage - I  
Ceded Credit Risk [Line Items]  
Catastrophe reinsurance loss limits per contract year 3,240
Exhausting loss from catastrophes $ 4,250
Number of reinstatements each year for each contract | reinstatement 1
Traditional Market, Placement Two | Coverage - II  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement $ 336
Contracts number | Contract 3
Traditional Market, Placement Three | Coverage - III  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement $ 2,500
Contracts number | Contract 5
Term of catastrophe reinsurance agreement contract (in years) 1 year
Insurance Linked Securities (ILS)  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement $ 2,700
Insurance Linked Securities (ILS) | Ten Contracts  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement $ 2,200
Contracts number | contract 10
Insurance Linked Securities (ILS) | One Contract  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement $ 175
Contracts number | contract 1
Insurance Linked Securities (ILS) | Two Contracts  
Ceded Credit Risk [Line Items]  
Limit of aggregate losses under aggregate excess agreement $ 325
Contracts number | contract 2
Insurance Linked Securities (ILS) | Coverage - II  
Ceded Credit Risk [Line Items]  
Number of reinstatements each year for each contract | reinstatement 1
Contracts number | Contract 2
Insurance Linked Securities (ILS) | Coverage - III  
Ceded Credit Risk [Line Items]  
Number of reinstatements each year for each contract | reinstatement 1
Contracts number | Contract 2