Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional Amount of Derivatives	$ 33,341	$ 23,516
Derivative Asset, Fair Value, Gross Asset	586	421
Derivative Liability, Fair Value, Gross Liability	1,261	975
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount of Derivatives	30,491	20,557
Derivative Asset, Fair Value, Gross Asset	545	388
Derivative Liability, Fair Value, Gross Liability	1,051	930
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,271	1,273
Derivative Asset, Fair Value, Gross Asset	2	66
Derivative Liability, Fair Value, Gross Liability	2	1
Not Designated as Hedging Instrument [Member] | Future [Member]
Derivative [Line Items]
Notional Amount of Derivatives	260	240
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	766	395
Derivative Asset, Fair Value, Gross Asset	50	2
Derivative Liability, Fair Value, Gross Liability	0	4
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	496	563
Derivative Asset, Fair Value, Gross Asset	20	34
Derivative Liability, Fair Value, Gross Liability	3	7
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,523	1,321
Derivative Asset, Fair Value, Gross Asset	2	29
Derivative Liability, Fair Value, Gross Liability	21	1
Not Designated as Hedging Instrument [Member] | Equity [Member]
Derivative [Line Items]
Notional Amount of Derivatives	358	472
Derivative Asset, Fair Value, Gross Asset	38	29
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	17,411	16,143
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	363	227
Derivative Liability, Fair Value, Gross Liability	371	62
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	530	693
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Variable 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	124	162
Not Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	150	150
Derivative Asset, Fair Value, Gross Asset	18	1
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption
Derivative [Line Items]
Notional Amount of Derivatives	7,756	0
Derivative Asset, Fair Value, Gross Asset	34	0
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	0
Derivative Asset, Fair Value, Gross Asset	18	0
Derivative Liability, Fair Value, Gross Liability	0	0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount of Derivatives	2,850	2,959
Derivative Asset, Fair Value, Gross Asset	41	33
Derivative Liability, Fair Value, Gross Liability	210	45
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,310	941
Derivative Asset, Fair Value, Gross Asset	3	4
Derivative Liability, Fair Value, Gross Liability	113	33
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,019	1,320
Derivative Asset, Fair Value, Gross Asset	38	14
Derivative Liability, Fair Value, Gross Liability	1	11
Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivative [Line Items]
Notional Amount of Derivatives	114	153
Derivative Asset, Fair Value, Gross Asset	0	1
Derivative Liability, Fair Value, Gross Liability	0	0
Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	407	545
Derivative Asset, Fair Value, Gross Asset	0	14
Derivative Liability, Fair Value, Gross Liability	$ 96	$ 1