Reinsurance - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Investments	$ 125,309		$ 125,309		$ 123,388
Other investments	6,325		6,325		6,272
Deposit assets, net of allowance for credit losses	31,592		31,592		30,537
LPINE
Ceded Credit Risk [Line Items]
Deposits assets	8,200		8,200		7,900
Investments	11,500		11,500		11,500
LPINE | Fixed Annuities
Ceded Credit Risk [Line Items]
Reinsurance recoverables	3,300		3,300		3,700
Reinsurance recoverables on unpaid losses	8		8		14
LNBAR
Ceded Credit Risk [Line Items]
Reinsurance recoverables	14,100		14,100		14,200
Reinsurance recoverables on unpaid losses	4,000		4,000		4,100
Reinsurance recoverable for unpaid claims, amortization	45	$ 40	90	$ 83
Other investments	1,400		1,400		1,400
Trust funded to support reinsurance receivable	12,700		12,700		12,200
Fortitude Re | Fixed Annuities
Ceded Credit Risk [Line Items]
Reinsurance recoverables	10,600		10,600		10,600
Reinsurance recoverables on unpaid losses	2,500		2,500		2,600
Reinsurance recoverable for unpaid claims, amortization	23	$ 22	46	$ 44
Deposit assets, net of allowance for credit losses	$ 2,600		$ 2,600		$ 3,000