Derivative Financial Instruments - Effect of Non-Qualifying Hedge Accounting (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 1	$ (37)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	22	(47)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2)	5
Equity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(7)	(7)
Fixed maturities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(1)	4
Embedded derivatives within reinsurance
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(9)	5
Embedded derivatives within reinsurance \| Level 3 \| Measured at fair value on a recurring basis
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) from standalone derivatives recognized in Net gains (losses)	0	1
Managed custody guarantees
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(1)
Stabilizer
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2)	$ 4
Stabilizer \| Level 3 \| Measured at fair value on a recurring basis
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) from standalone derivatives recognized in Net gains (losses)	$ (2)