v3.25.4
Insurance Contract Liabilities - Reconciliation to the LIC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Estimates of undiscounted gross cumulative claims                  
Insurance Contract Liabilities                  
Property and casualty provision for losses and loss adjustment expenses $ 48,221.2 $ 44,110.0 $ 41,221.8 $ 36,306.4 $ 32,329.1 $ 28,700.5 $ 26,528.3 $ 25,426.9 $ 25,284.5
Effect of discounting (6,485.4)                
Risk adjustment for non-financial risk 3,704.1                
Other (105.5)                
Liability for incurred claims 45,334.4                
Estimates of undiscounted gross cumulative claims | GMM                  
Insurance Contract Liabilities                  
Liability for incurred claims (730.1)                
Estimates of undiscounted gross cumulative claims | PAA                  
Insurance Contract Liabilities                  
Liability for incurred claims 44,604.3                
Estimates of undiscounted gross cumulative claims | PAA | Estimates of present value of future cash flows                  
Insurance Contract Liabilities                  
Liability for incurred claims 41,462.7                
Estimates of undiscounted gross cumulative claims | PAA | Risk adjustment for non-financial risk                  
Insurance Contract Liabilities                  
Liability for incurred claims 3,141.6                
Estimates of undiscounted net cumulative claims                  
Insurance Contract Liabilities                  
Property and casualty provision for losses and loss adjustment expenses 37,865.6 $ 34,197.6 $ 31,618.1 $ 27,800.1 $ 24,068.6 $ 21,468.6 $ 19,858.9 $ 19,334.7 $ 19,750.1
Effect of discounting (5,043.5)                
Risk adjustment for non-financial risk 2,640.8                
Other (731.8)                
Liability for incurred claims 34,731.1                
Estimates of undiscounted net cumulative claims | GMM                  
Insurance Contract Liabilities                  
Liability for incurred claims (701.5)                
Estimates of undiscounted net cumulative claims | PAA                  
Insurance Contract Liabilities                  
Liability for incurred claims 34,029.6                
Estimates of undiscounted net cumulative claims | PAA | Estimates of present value of future cash flows                  
Insurance Contract Liabilities                  
Liability for incurred claims 31,803.7                
Estimates of undiscounted net cumulative claims | PAA | Risk adjustment for non-financial risk                  
Insurance Contract Liabilities                  
Liability for incurred claims 2,225.9                
LIC | PAA                  
Insurance Contract Liabilities                  
Liability for incurred claims 44,604.3                
LIC | PAA | Estimates of present value of future cash flows                  
Insurance Contract Liabilities                  
Liability for incurred claims 41,462.7                
LIC | PAA | Risk adjustment for non-financial risk                  
Insurance Contract Liabilities                  
Liability for incurred claims 3,141.6                
AIC | PAA                  
Insurance Contract Liabilities                  
Liability for incurred claims 10,574.7                
AIC | PAA | Estimates of present value of future cash flows                  
Insurance Contract Liabilities                  
Liability for incurred claims 9,659.0                
AIC | PAA | Risk adjustment for non-financial risk                  
Insurance Contract Liabilities                  
Liability for incurred claims $ 915.7