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Reinsurance and Indemnification (Tables)
 9 Months Ended
Sep. 30, 2025
Reinsurance Disclosures [Abstract]  
Schedule of Effects of Reinsurance
Effects of reinsurance ceded and indemnification programs on property and casualty premiums earned and accident and health insurance premiums and contract charges
($ in millions)Three months ended September 30,Nine months ended September 30,
2025202420252024
Property and casualty insurance premiums earned
$(640)$(552)$(1,791)$(1,697)
Accident and health insurance premiums and contract charges (1)
(122)(16)(145)(37)
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)Three months ended September 30,Nine months ended September 30,
2025202420252024
Property and casualty insurance claims and claims expense (2)
$(163)$(662)$(1,989)$(1,178)
Accident, health and other policy benefits (1)
(112)(13)(140)(27)
(1)Includes group health business sold through reinsurance to Nationwide Life Insurance Company.
(2)2025 includes ceded losses related to the Nationwide Reinsurance Program for the California wildfires.
Schedule of Reinsurance and Indemnification Recoverables
Reinsurance and indemnification recoverables
Reinsurance and indemnification recoverables, net
($ in millions)September 30, 2025December 31, 2024
Property and casualty
Paid and due from reinsurers and indemnitors$294 $285 
Unpaid losses estimated (including IBNR) 8,993 8,602 
Total property and casualty$9,287 $8,887 
Accident and health insurance232 37 
Total$9,519 $8,924 
Schedule of Rollforward of Credit Loss Allowance for Reinsurance Recoverables
Rollforward of credit loss allowance for reinsurance recoverables
($ in millions)Three months ended September 30,Nine months ended September 30,
2025202420252024
Property and casualty (1) (2)
Beginning balance$(63)$(64)$(63)$(62)
(Increase) decrease in the provision for credit losses(1)2 (1)— 
Write-offs10 — 10 — 
Ending balance$(54)$(62)$(54)$(62)
(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.