Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Amount	$ 33,434	$ 33,341
Carrying Value / Fair Value of Assets	483	586
Derivative Liability, Fair Value, Gross Liability	1,122	1,137
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	29,400	30,491
Carrying Value / Fair Value of Assets	463	545
Derivative Liability, Fair Value, Gross Liability	878	927
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,683	1,271
Carrying Value / Fair Value of Assets	6	2
Derivative Liability, Fair Value, Gross Liability	4	2
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	850	766
Carrying Value / Fair Value of Assets	0	50
Derivative Liability, Fair Value, Gross Liability	28	0
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	241	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	477	496
Carrying Value / Fair Value of Assets	14	20
Derivative Liability, Fair Value, Gross Liability	2	3
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,515	1,523
Carrying Value / Fair Value of Assets	4	2
Derivative Liability, Fair Value, Gross Liability	10	21
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	306	358
Carrying Value / Fair Value of Assets	12	38
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	17,027	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	368	363
Derivative Liability, Fair Value, Gross Liability	359	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	472	530
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Carrying Value / Fair Value of Assets	26	18
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Interest Rate Swaption
Derivative [Line Items]
Notional Amount	6,555	7,756
Carrying Value / Fair Value of Assets	8	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	25	18
Derivative Liability, Fair Value, Gross Liability	3	0
Not Designated as Hedging Instrument | Interest Rate Future
Derivative [Line Items]
Notional Amount	96	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	4,034	2,850
Carrying Value / Fair Value of Assets	20	41
Derivative Liability, Fair Value, Gross Liability	244	210
Designated As Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,997	1,310
Carrying Value / Fair Value of Assets	5	3
Derivative Liability, Fair Value, Gross Liability	148	113
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	104	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	1,158	1,019
Carrying Value / Fair Value of Assets	14	38
Derivative Liability, Fair Value, Gross Liability	9	1
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	775	407
Carrying Value / Fair Value of Assets	1	0
Derivative Liability, Fair Value, Gross Liability	$ 84	$ 96