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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Amount of Derivatives	$ 32,104	$ 33,341
Derivative Asset, Fair Value, Gross Asset	510	586
Derivative Liability, Fair Value, Gross Liability	1,196	1,137
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount of Derivatives	27,306	30,491
Derivative Asset, Fair Value, Gross Asset	478	545
Derivative Liability, Fair Value, Gross Liability	949	927
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,609	1,271
Derivative Asset, Fair Value, Gross Asset	4	2
Derivative Liability, Fair Value, Gross Liability	3	2
Not Designated as Hedging Instrument [Member] | Future [Member]
Derivative [Line Items]
Notional Amount of Derivatives	255	164
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional Amount of Derivatives	809	766
Derivative Asset, Fair Value, Gross Asset	36	50
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	468	496
Derivative Asset, Fair Value, Gross Asset	11	20
Derivative Liability, Fair Value, Gross Liability	3	3
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,475	1,523
Derivative Asset, Fair Value, Gross Asset	5	2
Derivative Liability, Fair Value, Gross Liability	1	21
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	16,135	17,411
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	0	0
Derivative Asset, Fair Value, Gross Asset	356	363
Derivative Liability, Fair Value, Gross Liability	527	371
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member]
Derivative [Line Items]
Notional Amount of Derivatives	0	0
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	415	530
Not Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	150	150
Derivative Asset, Fair Value, Gross Asset	27	18
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption
Derivative [Line Items]
Notional Amount of Derivatives	5,555	7,756
Derivative Asset, Fair Value, Gross Asset	7	34
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Total Return Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	500	500
Derivative Asset, Fair Value, Gross Asset	24	18
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Future
Derivative [Line Items]
Notional Amount of Derivatives	97	96
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Equity Option
Derivative [Line Items]
Notional Amount of Derivatives	253	358
Derivative Asset, Fair Value, Gross Asset	8	38
Derivative Liability, Fair Value, Gross Liability	0	0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount of Derivatives	4,798	2,850
Derivative Asset, Fair Value, Gross Asset	32	41
Derivative Liability, Fair Value, Gross Liability	247	210
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,770	737
Derivative Asset, Fair Value, Gross Asset	9	3
Derivative Liability, Fair Value, Gross Liability	86	83
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,143	1,019
Derivative Asset, Fair Value, Gross Asset	5	38
Derivative Liability, Fair Value, Gross Liability	17	1
Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	809	687
Derivative Asset, Fair Value, Gross Asset	7	0
Derivative Liability, Fair Value, Gross Liability	64	30
Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,076	407
Derivative Asset, Fair Value, Gross Asset	11	0
Derivative Liability, Fair Value, Gross Liability	$ 80	$ 96

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