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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional Amount	$ 25,110	$ 23,516
Carrying Value / Fair Value of Assets	440	421
Derivative Liability, Fair Value, Gross Liability	1,102	975
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	21,814	20,557
Carrying Value / Fair Value of Assets	420	388
Derivative Liability, Fair Value, Gross Liability	1,005	930
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,182	1,273
Carrying Value / Fair Value of Assets	43	66
Derivative Liability, Fair Value, Gross Liability	1	1
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	724	395
Carrying Value / Fair Value of Assets	2	2
Derivative Liability, Fair Value, Gross Liability	21	4
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	228	240
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	548	563
Carrying Value / Fair Value of Assets	56	34
Derivative Liability, Fair Value, Gross Liability	8	7
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,816	1,321
Carrying Value / Fair Value of Assets	3	29
Derivative Liability, Fair Value, Gross Liability	34	1
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	472	472
Carrying Value / Fair Value of Assets	29	29
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	16,694	16,143
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	280	227
Derivative Liability, Fair Value, Gross Liability	148	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	645	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	148	162
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Carrying Value / Fair Value of Assets	7	1
Derivative Liability, Fair Value, Gross Liability	0	0
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	3,296	2,959
Carrying Value / Fair Value of Assets	20	33
Derivative Liability, Fair Value, Gross Liability	97	45
Designated As Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	935	941
Carrying Value / Fair Value of Assets	5	4
Derivative Liability, Fair Value, Gross Liability	28	33
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	133	153
Carrying Value / Fair Value of Assets	8	1
Derivative Liability, Fair Value, Gross Liability	1	0
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	1,683	1,320
Carrying Value / Fair Value of Assets	6	14
Derivative Liability, Fair Value, Gross Liability	25	11
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	545	545
Carrying Value / Fair Value of Assets	1	14
Derivative Liability, Fair Value, Gross Liability	$ 43	$ 1

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- Definition

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