Derivative Financial Instruments - Net Realized Gains (Losses) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivatives, Fair Value [Line Items]
Net Investment Income	$ 384,000,000	$ 366,000,000	$ 1,155,000,000	$ 1,235,000,000
Derivative, Gain (Loss) on Derivative, Net	40,000,000	118,000,000	100,000,000	189,000,000
Realized capital gains (losses)	(64,000,000)	(69,000,000)	(142,000,000)	(387,000,000)
Interest rate contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	64,000,000	121,000,000	121,000,000	178,000,000
Interest rate contracts | Other Comprehensive Income (Loss) | Designated as Hedging Instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	(1,000,000)	0	(2,000,000)
Interest rate contracts | Investment Income | Designated as Hedging Instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Foreign exchange contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2,000,000	3,000,000	2,000,000	7,000,000
Foreign exchange contracts | Other Comprehensive Income (Loss) | Designated as Hedging Instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	6,000,000	54,000,000	(9,000,000)	105,000,000
Foreign exchange contracts | Investment Income | Designated as Hedging Instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	3,000,000	2,000,000	7,000,000	7,000,000
Net realized gains (losses) on derivatives			7,000,000	7,000,000
Foreign exchange contracts | Other Net Realized Capital Gains (Losses) | Designated as Hedging Instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Net realized gains (losses) on derivatives			0	0
Foreign exchange contracts | Gain (Loss) on Investments | Designated as Hedging Instrument | Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0
Fixed maturities
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(3,000,000)	(2,000,000)	(3,000,000)	(5,000,000)
Realized capital gains (losses)	(3,000,000)	(2,000,000)	(3,000,000)	(5,000,000)
Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(15,000,000)	(6,000,000)	(12,000,000)	(8,000,000)
Credit contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ 1,000,000	$ 0	$ (3,000,000)