Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Document Period End Date	Jun. 30, 2022
Notional Amount	$ 28,057	$ 23,516
Carrying Value / Fair Value of Assets	474	421
Derivative Liability, Fair Value, Gross Liability	1,293	975
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	24,982	20,557
Carrying Value / Fair Value of Assets	458	388
Derivative Liability, Fair Value, Gross Liability	1,060	930
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,143	1,273
Carrying Value / Fair Value of Assets	23	66
Derivative Liability, Fair Value, Gross Liability	1	1
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	227	240
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	755	395
Carrying Value / Fair Value of Assets	0	2
Derivative Liability, Fair Value, Gross Liability	21	4
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	524	563
Carrying Value / Fair Value of Assets	26	34
Derivative Liability, Fair Value, Gross Liability	5	7
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,675	1,321
Carrying Value / Fair Value of Assets	13	29
Derivative Liability, Fair Value, Gross Liability	39	1
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	298	472
Carrying Value / Fair Value of Assets	43	29
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Carrying Value / Fair Value of Assets	18	1
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	326	227
Derivative Liability, Fair Value, Gross Liability	250	62
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	584	693
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]
Derivative [Line Items]
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	160	162
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	17,317	16,143
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Interest Rate Swaption
Derivative [Line Items]
Notional Amount	2,893	0
Carrying Value / Fair Value of Assets	9	0
Derivative Liability, Fair Value, Gross Liability	0	0
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	3,075	2,959
Carrying Value / Fair Value of Assets	16	33
Derivative Liability, Fair Value, Gross Liability	233	45
Designated As Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,338	941
Carrying Value / Fair Value of Assets	2	4
Derivative Liability, Fair Value, Gross Liability	128	33
Designated As Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount		1,320
Carrying Value / Fair Value of Assets		14
Derivative Liability, Fair Value, Gross Liability		11
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	114	153
Carrying Value / Fair Value of Assets	0	1
Derivative Liability, Fair Value, Gross Liability	0	0
Designated As Hedging Instrument | Purchase Commitment
Derivative [Line Items]
Notional Amount		545
Carrying Value / Fair Value of Assets		14
Derivative Liability, Fair Value, Gross Liability		$ 1
Designated As Hedging Instrument | Forward Contracts
Derivative [Line Items]
Notional Amount	1,170
Carrying Value / Fair Value of Assets	14
Derivative Liability, Fair Value, Gross Liability	5
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	453
Carrying Value / Fair Value of Assets	0
Derivative Liability, Fair Value, Gross Liability	$ 100