Reinsurance - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Investments	$ 130,120		$ 130,120		$ 124,051
Other investments	7,489		7,489		6,935
Deposit assets, net of allowance for credit losses	33,383		33,383		30,537
LPINE
Ceded Credit Risk [Line Items]
Deposits assets	8,700		8,700		7,900
Investments	12,900		12,900		11,500
LPINE | Fixed Annuities
Ceded Credit Risk [Line Items]
Reinsurance recoverables	4,100		4,100		3,700
Reinsurance recoverables on unpaid losses	41		41		14
LNBAR
Ceded Credit Risk [Line Items]
Reinsurance recoverables	14,000		14,000		14,200
Reinsurance recoverables on unpaid losses	3,900		3,900		4,100
Reinsurance recoverable for unpaid claims, amortization	48	$ 42	138	$ 125
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	$ 23	69	$ 67
Deposit assets, net of allowance for credit losses	$ 2,500		$ 2,500		$ 3,000