Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Document Period End Date	Sep. 30, 2022
Notional Amount	$ 30,851	$ 23,516
Carrying Value / Fair Value of Assets	536	421
Derivative Liability, Fair Value, Gross Liability	1,302	975
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	27,967	20,557
Carrying Value / Fair Value of Assets	465	388
Derivative Liability, Fair Value, Gross Liability	1,046	930
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,048	1,273
Carrying Value / Fair Value of Assets	2	66
Derivative Liability, Fair Value, Gross Liability	7	1
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	215	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	776	395
Carrying Value / Fair Value of Assets	0	2
Derivative Liability, Fair Value, Gross Liability	34	4
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]
Derivative [Line Items]
Notional Amount	462	563
Carrying Value / Fair Value of Assets	25	34
Derivative Liability, Fair Value, Gross Liability	8	7
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	1,723	1,321
Carrying Value / Fair Value of Assets	6	29
Derivative Liability, Fair Value, Gross Liability	50	1
Not Designated as Hedging Instrument | Equity Options
Derivative [Line Items]
Notional Amount	296	472
Carrying Value / Fair Value of Assets	49	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	27	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	316	227
Derivative Liability, Fair Value, Gross Liability	256	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	550	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	139	162
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	17,485	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	5,312	0
Carrying Value / Fair Value of Assets	40	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Total Return Swap
Derivative [Line Items]
Notional Amount	500	0
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	2	0
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	2,884	2,959
Carrying Value / Fair Value of Assets	71	33
Derivative Liability, Fair Value, Gross Liability	256	45
Designated As Hedging Instrument | Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	1,335	941
Carrying Value / Fair Value of Assets	4	4
Derivative Liability, Fair Value, Gross Liability	140	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	7	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	1,028
Carrying Value / Fair Value of Assets	67
Derivative Liability, Fair Value, Gross Liability	0
Designated As Hedging Instrument | Other Contract
Derivative [Line Items]
Notional Amount	407
Carrying Value / Fair Value of Assets	0
Derivative Liability, Fair Value, Gross Liability	$ 109