Investments (excluding Consolidated Investment Entities) - Net Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Realized Gain/(Losses) [Line Items]
Net gains (losses)	$ (45)	$ (34)
Embedded derivatives within fixed maturities
Realized Gain/(Losses) [Line Items]
Net gains (losses)	(1)	4
Standalone derivative
Realized Gain/(Losses) [Line Items]
Net gains (losses)	0	1
Managed custody guarantees
Realized Gain/(Losses) [Line Items]
Net gains (losses)	0	(1)
Stabilizer
Realized Gain/(Losses) [Line Items]
Net gains (losses)	(2)	4
Derivatives
Realized Gain/(Losses) [Line Items]
Net gains (losses)	17	(53)
Mortgage loans on real estate
Realized Gain/(Losses) [Line Items]
Net gains (losses)	0	(6)
Other investments
Realized Gain/(Losses) [Line Items]
Net gains (losses)	24	(5)
Fixed maturities, available-for-sale, including securities pledged
Realized Gain/(Losses) [Line Items]
Net gains (losses)	(16)	1
Fixed maturities, at fair value option
Realized Gain/(Losses) [Line Items]
Net gains (losses)	(64)	20
Equity securities, at fair value
Realized Gain/(Losses) [Line Items]
Net gains (losses)	$ (3)	$ 1