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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Document Period End Date	Sep. 30, 2021
Notional Amount	$ 24,191	$ 23,298
Carrying Value / Fair Value of Assets	374	229
Derivative Liability, Fair Value, Gross Liability	1,022	987
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	21,148	21,007
Carrying Value / Fair Value of Assets	352	208
Derivative Liability, Fair Value, Gross Liability	981	947
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,199	1,084
Carrying Value / Fair Value of Assets	70	93
Derivative Liability, Fair Value, Gross Liability	1	1
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	234	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	317	347
Carrying Value / Fair Value of Assets	0	4
Derivative Liability, Fair Value, Gross Liability	3	2
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	588	612
Carrying Value / Fair Value of Assets	31	11
Derivative Liability, Fair Value, Gross Liability	14	19
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,892	1,517
Carrying Value / Fair Value of Assets	22	13
Derivative Liability, Fair Value, Gross Liability	2	0
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	535	395
Carrying Value / Fair Value of Assets	45	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	0	0
Derivative Liability, Fair Value, Gross Liability	4	18
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	184	58
Derivative Liability, Fair Value, Gross Liability	39	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	727	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	191	155
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	16,233	16,644
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	3,043	2,291
Carrying Value / Fair Value of Assets	22	21
Derivative Liability, Fair Value, Gross Liability	41	40
Designated As Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	983	802
Carrying Value / Fair Value of Assets	0	3
Derivative Liability, Fair Value, Gross Liability	28	24
Designated As Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	1,250	1,255
Carrying Value / Fair Value of Assets	16	10
Derivative Liability, Fair Value, Gross Liability	8	15
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	173	234
Carrying Value / Fair Value of Assets	1	8
Derivative Liability, Fair Value, Gross Liability	2	1
Designated As Hedging Instrument | Purchase Commitment
Derivative [Line Items]
Notional Amount	637	0
Carrying Value / Fair Value of Assets	5	0
Derivative Liability, Fair Value, Gross Liability	$ 3	$ 0

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