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Reinsurance and Indemnification (Tables) | 9 Months Ended
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Sep. 30, 2024
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,
| 2024 |  | 2023 |  | 2024 |  | 2023
Property and casualty insurance premiums earned |  | $ | (552) |  |  | $ | (514) |  |  | $ | (1,697) |  |  | $ | (1,455) |
Accident and health insurance premiums and contract charges |  | (16) |  |  | (16) |  |  | (37) |  |  | (35) |
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,
| 2024 |  | 2023 |  | 2024 |  | 2023
Property and casualty insurance claims and claims expense |  | $ | (662) |  |  | $ | (274) |  |  | $ | (1,178) |  |  | $ | (534) |
Accident, health and other policy benefits |  | (13) |  |  | (7) |  |  | (27) |  |  | (32) |
Schedule of Reinsurance and Indemnification Recoverables | Reinsurance and indemnification recoverables
Reinsurance and indemnification recoverables, net
($ in millions) |  | September 30, 2024 |  | December 31, 2023
Property and casualty |  |  |  |
Paid and due from reinsurers and indemnitors |  | $ | 234 |  |  | $ | 254 |
Unpaid losses estimated (including IBNR) |  | 8,728 |  |  | 8,396 |
Total property and casualty |  | $ | 8,962 |  |  | $ | 8,650 |
Accident and health insurance |  | 51 |  |  | 159 |
Total |  | $ | 9,013 |  |  | $ | 8,809 |
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,
| 2024 |  | 2023 |  | 2024 |  | 2023
Property and casualty (1) (2) |  |  |  |  |  |  |  |
Beginning balance |  | $ | (64) |  |  | $ | (61) |  |  | $ | (62) |  |  | $ | (62) |
Decrease in the provision for credit losses |  | 2 |  |  | — |  |  | — |  |  | 1 |
Write-offs |  | — |  |  | — |  |  | — |  |  | — |
Ending balance |  | $ | (62) |  |  | $ | (61) |  |  | $ | (62) |  |  | $ | (61) |
Accident and health insurance |  |  |  |  |  |  |  |
Beginning balance |  | $ | (3) |  |  | $ | (3) |  |  | $ | (3) |  |  | $ | (3) |
Increase in the provision for credit losses |  | — |  |  | — |  |  | — |  |  | — |
Write-offs |  | — |  |  | — |  |  | — |  |  | — |
Reinsurance recoverables classified as held for sale |  | 1 |  |  | — |  |  | 1 |  |  | — |
Ending balance |  | $ | (2) |  |  | $ | (3) |  |  | $ | (2) |  |  | $ | (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.

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- Definition This element may be used as a single block of text to encapsulate entire disclosure, including data and tables for reinsurance claims and benefits ceded. + References No definition available. + Details
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- Definition Schedule of Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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