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Reinsurance and Indemnification (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Property and casualty insurance premiums earned |  | $ | (608) |  |  | $ | (588) |  |  | $ | (1,151) |  |  | $ | (1,145) |
Accident and health insurance premiums and contract charges |  | (10) |  |  | (11) |  |  | (23) |  |  | (21) |
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 June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Property and casualty insurance claims and claims expense (1) |  | $ | (141) |  |  | $ | (284) |  |  | $ | (1,826) |  |  | $ | (516) |
Accident, health and other policy benefits |  | (9) |  |  | (8) |  |  | (28) |  |  | (14) |
(1)2025 includes ceded losses related to the Nationwide Reinsurance Program for the California wildfires and March wind/hail events.
Schedule of Reinsurance and Indemnification Recoverables | Reinsurance and indemnification recoverables
Reinsurance and indemnification recoverables, net
($ in millions) |  | June 30, 2025 |  | December 31, 2024
Property and casualty |  |  |  |
Paid and due from reinsurers and indemnitors |  | $ | 317 |  |  | $ | 285 |
Unpaid losses estimated (including IBNR) |  | 9,285 |  |  | 8,602 |
Total property and casualty |  | $ | 9,602 |  |  | $ | 8,887 |
Accident and health insurance |  | 43 |  |  | 37 |
Total |  | $ | 9,645 |  |  | $ | 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 June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Property and casualty (1) (2) |  |  |  |  |  |  |  |
Beginning balance |  | $ | (63) |  |  | $ | (64) |  |  | $ | (63) |  |  | $ | (62) |
Decrease (increase) in the provision for credit losses |  | — |  |  | — |  |  | — |  |  | (2) |
Write-offs |  | — |  |  | — |  |  | — |  |  | — |
Ending balance |  | $ | (63) |  |  | $ | (64) |  |  | $ | (63) |  |  | $ | (64) |
(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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