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Separate Accounts - Narrative (Details) - USD ($) $ in Billions	Dec. 31, 2023	Dec. 31, 2022
Insurance [Abstract]
Separate Accounts, Modified Coinsurance	$ 6.4	$ 6.6

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- Definition

Separate Accounts, Modified Coinsurance

+ References

No definition available.

+ Details

Name:	tl_SeparateAccountsModifiedCoinsurance
Namespace Prefix:	tl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration