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Reinsurance and Indemnification (Tables)
 12 Months Ended
Dec. 31, 2024
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 programs 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)202420232022
Property and casualty insurance premiums written
Direct$60,574 $54,632 $50,065 
Assumed352 396 245 
Ceded(2,203)(2,018)(1,824)
Property and casualty insurance premiums written, net of recoverables$58,723 $53,010 $48,486 
Property and casualty insurance premiums earned
Direct$58,221 $52,301 $47,552 
Assumed377 358 221 
Ceded(2,210)(1,989)(1,869)
Property and casualty insurance premiums earned, net of recoverables$56,388 $50,670 $45,904 
Accident and health insurance premiums and contract charges
Direct$1,945 $1,865 $1,838 
Assumed26 28 31 
Ceded (50)(47)(37)
Accident and health insurance premiums and contract charges, net of recoverables$1,921 $1,846 $1,832 
Schedule of Effects of Reinsurance Ceded and Indemnification Programs on Property and Casualty Insurance Claims and Claims Expense and Accident, Health and Other Policy Benefits
Effects of reinsurance ceded and indemnification programs on property and casualty insurance claims and claims expense and accident, health and other policy benefits
($ in millions)For the years ended December 31,
202420232022
Property and casualty insurance claims and claims expense
$(1,716)$(633)$(1,600)
Accident, health and other policy benefits(36)(44)15 
Schedule of Reinsurance and Indemnification Recoverables, Net
Reinsurance and indemnification recoverables, net
As of December 31,
($ in millions)20242023
Property and casualty
Paid and due from reinsurers and indemnitors$285 $254 
Unpaid losses estimated (including IBNR)8,602 8,396 
Total property and casualty$8,887 $8,650 
Accident and health insurance37 159 
Total$8,924 $8,809 
Schedule of Rollforward of Credit Loss Allowance for Reinsurance Recoverables
Rollforward of credit loss allowance for reinsurance recoverables
For the years ended December 31,
($ in millions)20242023
Property and casualty (1) (2)
Beginning balance$(62)$(62)
Increase in the provision for credit losses(1)(1)
Write-offs— 1 
Ending balance$(63)$(62)
Accident and health insurance
Beginning balance$(3)$(3)
Decrease in the provision for credit losses
2 — 
Write-offs— — 
Reinsurance recoverables allowance reclassified to held for sale
1 — 
Ending Balance$— $(3)
(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.