Reinsurance - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 01, 2023 agreement
Ceded Credit Risk [Line Items]
Number of reinsurance recoverable agreements | agreement				2
Deposit assets, net of allowance for credit losses	$ 29,888	$ 29,888	$ 28,789
Investments	126,595	126,595	124,331
Fortitude Re
Ceded Credit Risk [Line Items]
Deposits assets	7,900	7,900	7,800
Investments	9,300	9,300	9,900
Fixed Annuities | Fortitude Re
Ceded Credit Risk [Line Items]
Reinsurance recoverables	10,500	10,500	10,500
Reinsurance recoverables on unpaid losses	2,600	2,600	2,700
Reinsurance recoverable amortization	22	44
Deposit assets, net of allowance for credit losses	$ 3,700	$ 3,700	$ 4,200