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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Amount	$ 33,433	$ 33,341
Carrying Value / Fair Value of Assets	546	586
Derivative Liability, Fair Value, Gross Liability	1,274	1,137
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	28,770	30,491
Carrying Value / Fair Value of Assets	518	545
Derivative Liability, Fair Value, Gross Liability	927	927
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,622	1,271
Carrying Value / Fair Value of Assets	7	2
Derivative Liability, Fair Value, Gross Liability	24	2
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	826	766
Carrying Value / Fair Value of Assets	0	50
Derivative Liability, Fair Value, Gross Liability	24	0
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	245	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	445	496
Carrying Value / Fair Value of Assets	12	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	3	2
Derivative Liability, Fair Value, Gross Liability	38	21
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	282	358
Carrying Value / Fair Value of Assets	14	38
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	16,535	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	378	363
Derivative Liability, Fair Value, Gross Liability	368	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	441	530
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Carrying Value / Fair Value of Assets	32	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	30	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	42	18
Derivative Liability, Fair Value, Gross Liability	30	0
Not Designated as Hedging Instrument | Interest Rate Future
Derivative [Line Items]
Notional Amount	95	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	4,663	2,850
Carrying Value / Fair Value of Assets	28	41
Derivative Liability, Fair Value, Gross Liability	347	210
Designated As Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	2,340	1,310
Carrying Value / Fair Value of Assets	6	3
Derivative Liability, Fair Value, Gross Liability	180	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	7	0
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	1,146	1,019
Carrying Value / Fair Value of Assets	22	38
Derivative Liability, Fair Value, Gross Liability	1	1
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	1,073	407
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	$ 159	$ 96

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