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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Prior Year Reserve Re-Estimates Included in Claims and Claims Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Increase (decrease) in claims and claims expense |  |  |
Prior years | $ (251) | $ (151) |
Auto |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (249) | (74) |
Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (8) | (189) |
Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | 46 | 52 |
Commercial lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (28) | 51 |
Other business lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (15) | 5 |
Run-off Property-Liability |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | 3 | 4 |
Catastrophe losses |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (16) | (162) |
Catastrophe losses | Auto |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (11) | (7) |
Catastrophe losses | Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (1) | (149) |
Catastrophe losses | Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (7) | (3) |
Catastrophe losses | Commercial lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | 3 | (3) |
Catastrophe losses | Other business lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | 0 | 0 |
Catastrophe losses | Run-off Property-Liability |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | 0 | 0 |
Non-catastrophe losses |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (235) | 11 |
Non-catastrophe losses | Auto |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (238) | (67) |
Non-catastrophe losses | Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (7) | (40) |
Non-catastrophe losses | Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | 53 | 55 |
Non-catastrophe losses | Commercial lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (31) | 54 |
Non-catastrophe losses | Other business lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | (15) | 5 |
Non-catastrophe losses | Run-off Property-Liability |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years | $ 3 | $ 4 |
Nationwide Reinsurance Program | Run-off Property-Liability |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years |  |  | $ 66

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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