Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Proceeds from sale of investments
Debt Securities, Available-for-Sale, Realized Gain	$ 38,000,000	$ 44,000,000	$ 51,000,000
Debt Securities, Available-for-Sale, Realized Loss	66,000,000	32,000,000	47,000,000
Available for Sale Securities, Gross Realized Gains (Losses), Proceeds on Sales	3,916,000,000	2,551,000,000	3,356,000,000
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	(132,000,000)	(44,000,000)	(134,000,000)
Mortgage loans on real estate
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	(6,000,000)	0	(10,000,000)
Other derivatives, net
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	(1,000,000)	2,000,000	0
Stabilizer
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	10,000,000	(14,000,000)	(1,000,000)
Embedded derivatives with fixed maturities
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	5,000,000	(4,000,000)	(1,000,000)
MCGs(6)
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	4,000,000	4,000,000	(2,000,000)
Derivatives
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	(36,000,000)	121,000,000	11,000,000
Other investments
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	1,000,000	0	0
Fixed maturities, available-for-sale, including securities pledged
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	(20,000,000)	(18,000,000)	(27,000,000)
Fixed maturities, at fair value using the fair value option
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	(83,000,000)	(135,000,000)	(100,000,000)
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Realized capital gains (losses)	$ (6,000,000)	$ 0	$ (4,000,000)