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Reinsurance and Indemnification (Tables)
 12 Months Ended
Dec. 31, 2025
Reinsurance Disclosures [Abstract]  
Schedule of Effects of Reinsurance and Indemnification on Property and Casualty Premiums Written and Earned and Accident and Health Insurance Premiums and Contract Charges
Effects of reinsurance and indemnification on property and casualty premiums written and earned and accident and health insurance premiums and contract charges
For the years ended December 31,
($ in millions)202520242023
Property and casualty insurance premiums written
Direct$64,596 $60,574 $54,632 
Assumed385 352 396 
Ceded(2,429)(2,203)(2,018)
Property and casualty insurance premiums written, net of recoverables$62,552 $58,723 $53,010 
Property and casualty insurance premiums earned
Direct$62,511 $58,221 $52,301 
Assumed389 377 358 
Ceded(2,397)(2,210)(1,989)
Property and casualty insurance premiums earned, net of recoverables$60,503 $56,388 $50,670 
Accident and health insurance premiums and contract charges
Direct$1,188 $1,945 $1,865 
Assumed42 26 28 
Ceded (284)(50)(47)
Accident and health insurance premiums and contract charges, net of recoverables (1)
$946 $1,921 $1,846 
Schedule of Effects of Reinsurance Ceded and Indemnification Programs on Property and Casualty Insurance Claims and Claims Expense and Accident, Health and Other Policy Benefits
Effects of reinsurance ceded and indemnification programs on property and casualty insurance claims and claims expense and accident, health and other policy benefits
($ in millions)For the years ended December 31,
202520242023
Property and casualty insurance claims and claims expense (2)
$(1,348)$(1,716)$(633)
Accident, health and other policy benefits (1)
(254)(36)(44)
(1)Includes group health business sold through reinsurance to Nationwide Life Insurance Company.
(2)2025 includes ceded losses to the Nationwide Reinsurance Program for the California wildfires.
Schedule of Reinsurance and Indemnification Recoverables, Net
Reinsurance and indemnification recoverables, net
As of December 31,
($ in millions)20252024
Property and casualty
Paid and due from reinsurers and indemnitors$267 $285 
Unpaid losses estimated (including IBNR)8,012 8,602 
Total property and casualty$8,279 $8,887 
Accident and health insurance222 37 
Total$8,501 $8,924 
Schedule of Rollforward of Credit Loss Allowance for Reinsurance Recoverables
Rollforward of credit loss allowance for reinsurance recoverables
For the years ended December 31,
($ in millions)20252024
Property and casualty (1) (2)
Beginning balance$(63)$(62)
Increase in the provision for credit losses(1)(1)
Write-offs10 — 
Ending balance$(54)$(63)
(1)Primarily related to Run-off Property-Liability reinsurance ceded.
(2)Indemnification recoverables are considered collectible based on the industry pool and facility enabling legislation.