Reinsurance - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 01, 2023 agreement	Dec. 31, 2020 USD ($)
Ceded Credit Risk [Line Items]
Maximum retention per single insured life on fixed and VUL insurance contracts	$ 20.0
Percent of mortality risk reinsured on newly issued non-term life insurance contracts	27.00%
Number of reinsurance recoverable agreements | agreement				2
Deposit assets, net of allowance for credit losses	$ 28,789.0	$ 11,628.0
Investments	124,331.0	131,654.0
Fixed maturity available-for-sale securities, at fair value	88,738.0	99,736.0
Other investments	5,015.0	3,739.0
Accrued investment income	1,082.0	1,253.0
Reinsurance recoverables, net of allowance for credit losses	29,843.0	19,953.0			$ 19,388.0
Realized gain (loss)	(4,311.0)	840.0	$ (867.0)
Reinsurance recoverable, allowance for credit loss	81.0	317.0
Fortitude Re
Ceded Credit Risk [Line Items]
Deposits assets	7,800.0
Investments	9,900.0
Fixed maturity available-for-sale securities, at fair value	8,900.0
Other investments	759.0
Cash and cash equivalents	141.0
Accrued investment income	103.0
Resolution Life
Ceded Credit Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses	5,000.0
Reinsurance recoverable for paid and unpaid claims and claims adjustments	3,800.0	4,100.0
Resolution Life | Over-Collateralization
Ceded Credit Risk [Line Items]
Realized gain (loss)			635.0
Protective
Ceded Credit Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses	9,100.0	9,600.0
Reinsurance recoverable for paid and unpaid claims and claims adjustments	10,500.0	11,500.0
Athene Holding Ltd.
Ceded Credit Risk [Line Items]
Fixed maturity available-for-sale securities, at fair value	177.0	474.0
Other investments	41.0	42.0
Accrued investment income	23.0	35.0
Reinsurance ACL and deposit assets	2,700.0	3,800.0
Reserves associated with modified coinsurance reinsurance arrangements	2,774.0	3,809.0
Letter of credit	83.0
Amount of amortization, after-tax, of deferred gain on business sold	33.0	25.0	$ 26.0
Athene Holding Ltd. | Over-Collateralization
Ceded Credit Risk [Line Items]
Reserves associated with modified coinsurance reinsurance arrangements	77.0
Swiss Re
Ceded Credit Risk [Line Items]
Reinsurance recoverables, net of allowance for credit losses	1,600.0	1,600.0
Trust funded to support reinsurance receivable	656.0	$ 710.0
Fixed Annuities | Fortitude Re
Ceded Credit Risk [Line Items]
Reinsurance recoverables	10,500.0
Reinsurance recoverables on unpaid losses	2,700.0
Reinsurance recoverable for unpaid claims and claims adjustments	11.0
Deposit assets, net of allowance for credit losses	$ 4,200.0