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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Amount	$ 23,577	$ 23,298
Carrying Value / Fair Value of Assets	268	229
Derivative Liability, Fair Value, Gross Liability	943	987
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	21,230	21,007
Carrying Value / Fair Value of Assets	255	208
Derivative Liability, Fair Value, Gross Liability	893	947
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,107	1,084
Carrying Value / Fair Value of Assets	67	93
Derivative Liability, Fair Value, Gross Liability	3	1
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	285	258
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	475	347
Carrying Value / Fair Value of Assets	2	4
Derivative Liability, Fair Value, Gross Liability	10	2
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	627	612
Carrying Value / Fair Value of Assets	19	11
Derivative Liability, Fair Value, Gross Liability	12	19
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,720	1,517
Carrying Value / Fair Value of Assets	32	13
Derivative Liability, Fair Value, Gross Liability	3	0
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	443	395
Carrying Value / Fair Value of Assets	26	29
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	16,423	16,644
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	109	58
Derivative Liability, Fair Value, Gross Liability	0	0
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	720	752
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	136	155
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	9	18
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	2,347	2,291
Carrying Value / Fair Value of Assets	13	21
Derivative Liability, Fair Value, Gross Liability	50	40
Designated As Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	878	802
Carrying Value / Fair Value of Assets	2	3
Derivative Liability, Fair Value, Gross Liability	24	24
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	214	234
Carrying Value / Fair Value of Assets	6	8
Derivative Liability, Fair Value, Gross Liability	1	1
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	1,141	1,255
Carrying Value / Fair Value of Assets	5	10
Derivative Liability, Fair Value, Gross Liability	18	15
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	114	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	$ 7	$ 0

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- Definition

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