Insurance - Recoverables from reinsurance, progression of allowance for expected credit losses (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] | ||||
| Beginning Balance | $ 9 | $ 9 | $ 10 | $ 11 |
| Provision (credit) for expected credit losses | 0 | 0 | (1) | (2) |
| Write-offs charged against the allowance | 0 | 0 | 0 | 0 |
| Ending Balance | $ 9 | $ 9 | $ 9 | $ 9 |
| X | ||||||||||
- Definition Amount of the write-down or write-off of a receivable from a reinsurer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on reinsurance recoverable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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