Derivative Financial Instruments - Effect of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ 518	$ 545	$ 1,047	$ 1,090
Net gains (losses)	(4)	(56)	39	(72)
Gain (loss) on derivative, net	40	125	173	50
Not Designated as Hedging Instrument | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	0	0	(1)	(1)
Interest rate contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	39	114	165	58
Interest rate contracts | Cash Flow Hedging | Designated as Hedging Instrument | Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income	0	0	0	0
Interest rate contracts | Cash Flow Hedging | Designated as Hedging Instrument | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income	0	0	0	0
Interest rate contracts | Fair Value Hedging | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	0	0	0	0
Interest rate contracts | Fair Value Hedging | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	1	0	1	0
Interest rate contracts | Fair Value Hedging | Designated as Hedging Instrument | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	0	0	0	0
Interest rate contracts | Fair Value Hedging | Designated as Hedging Instrument | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	(1)	0	(1)	0
Foreign exchange contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	(1)	0	(3)	1
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income	3	(6)	11	(18)
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income	3	2	6	5
Gain (loss) on derivative, net	2	2	5	5
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	1	0	1	0
Foreign exchange contracts | Fair Value Hedging | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net			0	0
Foreign exchange contracts | Fair Value Hedging | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net			(2)	2
Foreign exchange contracts | Fair Value Hedging | Designated as Hedging Instrument | Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	0	0	0	0
Foreign exchange contracts | Fair Value Hedging | Designated as Hedging Instrument | Gain (Loss) on Investments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	1	0	4	(1)
Embedded derivative on reinsurance
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	4	8	4	(18)
Embedded derivative on reinsurance | Level 3 | Measured at fair value on a recurring basis
Derivative Instruments, Gain (Loss) [Line Items]
Change in derivative instruments excluded from assessment of hedge effectiveness and recognized in earnings	0	0	1	1
Gains (losses) from standalone derivatives recognized in Net gains (losses)	0	0	1	0
Equity contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	1	5	11	8
Fixed maturities
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	(1)	(2)	(2)	(1)
Gain (loss) on derivative, net	(1)	(2)	(2)	(1)
Managed Custody Guarantees
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	(1)	0	0	3
Gain (loss) on derivative, net	(1)	0	0	3
Managed custody guarantees
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	(1)	0	(1)	0
Gain (loss) on derivative, net	(1)	0	$ (1)	$ 0
Managed custody guarantees | 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)	$ 0