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Contingencies - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Reductions in premiums written, net | $ 128

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of decrease (increase) in unearned premiums. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInUnearnedPremiumsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration