Reinsurance Narrative (Details) $ in Millions							6 Months Ended	12 Months Ended			21 Months Ended
	Jan. 01, 2024 USD ($)	Sep. 01, 2023 USD ($)	Apr. 01, 2023 USD ($)	Apr. 01, 2022	Apr. 01, 2015	Jan. 02, 2013 USD ($) policy	Jun. 30, 2024 USD ($) company	Dec. 31, 2020 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 counterparty	May 31, 2018 counterparty
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage							65.00%
Deposit assets							$ 10,796					$ 10,574
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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, amount retained per event						$ 141,000
Business acquisition number of life insurance policies acquired reinsurance | policy						700,000
Number of counterparties | counterparty														2
Somerset Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Deposit assets							$ 2,152					1,619
Reinsurance payable							1,974					1,518
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]
Deposit assets							$ 3,660					$ 3,771
Reinsured amount		$ 9,000
Deferred reinsurance loss		$ (240)
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%
AuguStar
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsured amount			$ 10,000
Deferred reinsurance gain			$ 309
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%
AuguStar | Variable Annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage			10.00%
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