Derivative Financial Instruments - Effect of Non-Qualifying Hedge Accounting (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 33	$ (24)	$ 34	$ (42)
Interest rate contracts \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	31	(26)	48	(64)
Foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(6)	1	(5)
Fixed maturities \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(3)	2	(4)	6
Embedded derivatives within reinsurance \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	6	4	(8)	16
Managed Custody Guarantees \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(1)	2	(1)	1
Stabilizer \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	1	(2)	5
Credit Risk Contract \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 0	$ (1)	$ 0	$ (1)