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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Incurred Claims, Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Recoverables (Details)
claim in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
claim
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Auto insurance - liability coverage          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables $ 70,150        
Prior year reserve reestimates (1,520)        
Total prior year reserve reestimates (1,624)        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables 50,019        
All outstanding liabilities before 2021, net of recoverables 1,390        
Liabilities for claims and claim adjustment expenses, net of recoverables 21,521        
Auto insurance - liability coverage | Accident Year 2021          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 11,119 $ 11,291 $ 11,236 $ 10,917 $ 10,468
Prior year reserve reestimates (172)        
IBNR reserves plus expected development on reported claims $ 559        
Cumulative number of reported claims (in thousands) | claim 2,440        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 10,560 10,105 9,157 7,341 3,574
Auto insurance - liability coverage | Accident Year 2022          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 13,293 13,565 13,307 13,308 0
Prior year reserve reestimates (272)        
IBNR reserves plus expected development on reported claims $ 1,254        
Cumulative number of reported claims (in thousands) | claim 2,612        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 12,039 11,087 9,098 4,466 0
Auto insurance - liability coverage | Accident Year 2023          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 14,452 14,817 15,357 0 0
Prior year reserve reestimates (365)        
IBNR reserves plus expected development on reported claims $ 2,547        
Cumulative number of reported claims (in thousands) | claim 2,602        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 11,905 9,875 5,094 0 0
Auto insurance - liability coverage | Accident Year 2024          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 15,191 15,902 0 0 0
Prior year reserve reestimates (711)        
IBNR reserves plus expected development on reported claims $ 5,136        
Cumulative number of reported claims (in thousands) | claim 2,463        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 10,055 5,211 0 0 0
Auto insurance - liability coverage | Accident Year 2025          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 16,095 0 0 0 0
IBNR reserves plus expected development on reported claims $ 10,635        
Cumulative number of reported claims (in thousands) | claim 2,403        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 5,460 0 0 0 0
Auto insurance - liability coverage | Prior year reserve reestimates for pre-2021 accident years          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates (34)        
Auto insurance - liability coverage | Prior year reserve reestimates for ULAE          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates (70)        
Auto insurance - liability coverage | Other          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates 0        
Auto insurance - physical damage coverage          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 41,388        
Prior year reserve reestimates (238)        
Total prior year reserve reestimates (256)        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables 40,802        
All outstanding liabilities before 2021, net of recoverables 11        
Liabilities for claims and claim adjustment expenses, net of recoverables 597        
Auto insurance - physical damage coverage | Accident Year 2021          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 7,230 7,230 7,225 7,264 7,236
Prior year reserve reestimates 0        
IBNR reserves plus expected development on reported claims $ 3        
Cumulative number of reported claims (in thousands) | claim 4,633        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 7,227 7,229 7,250 7,306 6,803
Auto insurance - physical damage coverage | Accident Year 2022          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 9,052 9,052 9,011 9,324 0
Prior year reserve reestimates 0        
IBNR reserves plus expected development on reported claims $ 6        
Cumulative number of reported claims (in thousands) | claim 4,979        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 9,046 9,059 9,101 8,264 0
Auto insurance - physical damage coverage | Accident Year 2023          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 9,072 9,099 9,441 0 0
Prior year reserve reestimates (27)        
IBNR reserves plus expected development on reported claims $ (7)        
Cumulative number of reported claims (in thousands) | claim 4,807        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 9,079 9,104 8,498 0 0
Auto insurance - physical damage coverage | Accident Year 2024          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,337 8,548 0 0 0
Prior year reserve reestimates (211)        
IBNR reserves plus expected development on reported claims $ 8        
Cumulative number of reported claims (in thousands) | claim 4,385        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 8,329 7,826 0 0 0
Auto insurance - physical damage coverage | Accident Year 2025          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 7,697 0 0 0 0
IBNR reserves plus expected development on reported claims $ 576        
Cumulative number of reported claims (in thousands) | claim 3,830        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 7,121 0 0 0 0
Auto insurance - physical damage coverage | Prior year reserve reestimates for pre-2021 accident years          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates (8)        
Auto insurance - physical damage coverage | Prior year reserve reestimates for ULAE          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates (10)        
Auto insurance - physical damage coverage | Other          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates 0        
Homeowners          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 39,137        
Prior year reserve reestimates (77)        
Total prior year reserve reestimates (16)        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables 35,168        
All outstanding liabilities before 2021, net of recoverables 153        
Liabilities for claims and claim adjustment expenses, net of recoverables 4,122        
Homeowners | Accident Year 2021          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 6,510 6,563 6,522 6,465 6,318
Prior year reserve reestimates (53)        
IBNR reserves plus expected development on reported claims $ 55        
Cumulative number of reported claims (in thousands) | claim 999        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 6,455 6,409 6,294 6,060 4,464
Homeowners | Accident Year 2022          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 6,516 6,488 6,515 6,562 0
Prior year reserve reestimates 28        
IBNR reserves plus expected development on reported claims $ 169        
Cumulative number of reported claims (in thousands) | claim 795        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 6,347 6,231 5,961 3,910 0
Homeowners | Accident Year 2023          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,525 8,626 9,097 0 0
Prior year reserve reestimates (101)        
IBNR reserves plus expected development on reported claims $ 320        
Cumulative number of reported claims (in thousands) | claim 1,033        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 8,205 7,830 5,798 0 0
Homeowners | Accident Year 2024          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,657 8,608 0 0 0
Prior year reserve reestimates 49        
IBNR reserves plus expected development on reported claims $ 710        
Cumulative number of reported claims (in thousands) | claim 1,091        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 7,947 5,753 0 0 0
Homeowners | Accident Year 2025          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of recoverables 8,929 0 0 0 0
IBNR reserves plus expected development on reported claims $ 2,715        
Cumulative number of reported claims (in thousands) | claim 819        
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables $ 6,214 $ 0 $ 0 $ 0 $ 0
Homeowners | Prior year reserve reestimates for pre-2021 accident years          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates 27        
Homeowners | Prior year reserve reestimates for ULAE          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates 34        
Homeowners | Other          
Increase (decrease) in claims and claims expense          
Total prior year reserve reestimates $ 0