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Reinsurance (Narrative) (Details) $ in Millions						3 Months Ended			12 Months Ended
Reinsurance (Narrative) (Details) $ in Millions	Mar. 01, 2025 USD ($)	Sep. 01, 2023	Apr. 01, 2023	Apr. 01, 2022	Jan. 02, 2013 USD ($) subsidiary policy	Mar. 31, 2026 USD ($) company	Mar. 31, 2013 USD ($)	Mar. 31, 2000 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2021 counterparty	May 31, 2018 counterparty
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage						61.00%
Balance BOP						$ 694				$ 732
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							$ 20	$ 30	$ 10
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
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 \| 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%
Allstate
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Number of counterparties \| counterparty											2