Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Amount	$ 34,479	$ 33,341
Carrying Value / Fair Value of Assets	504	586
Derivative Liability, Fair Value, Gross Liability	1,059	1,137
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	31,096	30,491
Carrying Value / Fair Value of Assets	470	545
Derivative Liability, Fair Value, Gross Liability	856	927
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,578	1,271
Carrying Value / Fair Value of Assets	13	2
Derivative Liability, Fair Value, Gross Liability	1	2
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	1,006	766
Carrying Value / Fair Value of Assets	4	50
Derivative Liability, Fair Value, Gross Liability	8	0
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	186	164
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	478	496
Carrying Value / Fair Value of Assets	19	20
Derivative Liability, Fair Value, Gross Liability	5	3
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,528	1,523
Carrying Value / Fair Value of Assets	2	2
Derivative Liability, Fair Value, Gross Liability	14	21
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	336	358
Carrying Value / Fair Value of Assets	24	38
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	17,280	17,411
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	362	363
Derivative Liability, Fair Value, Gross Liability	333	371
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	495	530
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Carrying Value / Fair Value of Assets	16	18
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Interest Rate Swaption
Derivative [Line Items]
Notional Amount	7,957	7,756
Carrying Value / Fair Value of Assets	11	34
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Total Return Swap
Derivative [Line Items]
Notional Amount	500	500
Carrying Value / Fair Value of Assets	19	18
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Interest Rate Future
Derivative [Line Items]
Notional Amount	97	96
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	3,383	2,850
Carrying Value / Fair Value of Assets	34	41
Derivative Liability, Fair Value, Gross Liability	203	210
Designated As Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,701	1,310
Carrying Value / Fair Value of Assets	5	3
Derivative Liability, Fair Value, Gross Liability	112	113
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	114	114
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	3	0
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	1,161	1,019
Carrying Value / Fair Value of Assets	29	38
Derivative Liability, Fair Value, Gross Liability	2	1
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	407	407
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	$ 86	$ 96