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Reinsurance and Indemnification (Tables) | 9 Months Ended
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Sep. 30, 2023
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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Property and casualty insurance premiums earned |  | $ | (514) |  |  | $ | (479) |  |  | $ | (1,455) |  |  | $ | (1,362) |
Accident and health insurance premiums and contract charges |  | (16) |  |  | (12) |  |  | (35) |  |  | (28) |
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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Property and casualty insurance claims and claims expense (1) |  | $ | (274) |  |  | $ | (925) |  |  | $ | (534) |  |  | $ | (1,300) |
Accident, health and other policy benefits |  | (7) |  |  | 39 |  |  | (32) |  |  | 22 |
(1)Includes approximately $60 million of ceded losses related to the Nationwide Reinsurance Program for the nine months ended September 30, 2023. Ceded losses for the three and nine months ended September 30, 2022 included $305 million of expected reinsurance recoveries related to the Florida Excess Catastrophe Reinsurance Program for Hurricane Ian.
Schedule of Reinsurance and Indemnification Recoverables | Reinsurance and indemnification recoverables
Reinsurance and indemnification recoverables, net
($ in millions) |  | September 30, 2023 |  | December 31, 2022
Property and casualty |  |  |  |
Paid and due from reinsurers and indemnitors |  | $ | 268 |  |  | $ | 291 |
Unpaid losses estimated (including IBNR) |  | 8,654 |  |  | 9,176 |
Total property and casualty |  | $ | 8,922 |  |  | $ | 9,467 |
Accident and health insurance |  | 161 |  |  | 152 |
Total |  | $ | 9,083 |  |  | $ | 9,619 |
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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Property and casualty (1) (2) |  |  |  |  |  |  |  |
Beginning balance |  | $ | (61) |  |  | $ | (66) |  |  | $ | (62) |  |  | $ | (66) |
(Increase) decrease in the provision for credit losses |  | — |  |  | (5) |  |  | 1 |  |  | (5) |
Write-offs |  | — |  |  | 9 |  |  | — |  |  | 9 |
Ending balance |  | $ | (61) |  |  | $ | (62) |  |  | $ | (61) |  |  | $ | (62) |
Accident and health insurance |  |  |  |  |  |  |  |
Beginning balance |  | $ | (3) |  |  | $ | (8) |  |  | $ | (3) |  |  | $ | (8) |
Increase in the provision for credit losses |  | — |  |  | — |  |  | — |  |  | — |
Write-offs |  | — |  |  | — |  |  | — |  |  | — |
Ending balance |  | $ | (3) |  |  | $ | (8) |  |  | $ | (3) |  |  | $ | (8) |
(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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