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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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Reinsurance (Narrative) (Details) $ in Millions									6 Months Ended	12 Months Ended			21 Months Ended
Reinsurance (Narrative) (Details) $ in Millions	Mar. 01, 2025 USD ($)	Oct. 01, 2024 USD ($)	Jan. 01, 2024 USD ($)	Sep. 01, 2023 USD ($)	Apr. 01, 2023 USD ($)	Apr. 01, 2022	Apr. 01, 2015	Jan. 02, 2013 USD ($) subsidiary policy	Jun. 30, 2025 company	Dec. 31, 2020 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2000 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2021 counterparty	May 31, 2018 counterparty
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage									60.00%
Number of Reinsurance Companies \| company									4
Geographic Distribution, Domestic
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance, retention policy, amount retained per life										$ 10	$ 20	$ 30
Hartford Life Business
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, amount retained per event								$ 141,000
Business acquisition through reinsurance transactions, number of subsidiaries of acquiree \| subsidiary								3
Business acquisition number of life insurance policies acquired reinsurance \| policy								700,000
Number of counterparties \| counterparty															2
Wilton Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Deferred reinsurance loss		$ (980)
Wilton Re \| Universal life products
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage		40.00%
Somerset Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Deferred reinsurance gain			$ 363
Somerset Re \| Universal life products
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage			30.00%
Prismic Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsured amount				$ 9,000
Prismic Re \| Structured Settlement Annuity
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage				70.00%
Prismic Re \| Coinsurance with funds witheld
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage				90.00%
Prismic Re \| Coinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage				10.00%
Prismic Re International
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsured amount	$ 7,000
AuguStar
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsured amount					$ 10,000
AuguStar \| Variable Annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage					10.00%
AuguStar \| Separate account liabilities under MODCO
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage					100.00%
AuguStar \| General account liabilities under MODCO
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage					100.00%
Empower \| Separate account liabilities under MODCO
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage						100.00%
Empower \| General account liabilities under MODCO
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage						100.00%
Union Hamilton \| Quote Share Reinsurance for HDI v.3.0 VA Business
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage							50.00%
Reinsurance retention policy, amount retained per event													$ 2,900
Allstate
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Number of counterparties \| counterparty														2