Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Amount	$ 33,994	$ 32,104
Carrying Value / Fair Value of Assets	270	154
Derivative Liability, Fair Value, Gross Liability	287	254
Derivative Asset, Subject to Master Netting Arrangement, after Offset	544	510
Derivative Liability, Subject to Master Netting Arrangement, after Offset	1,126	1,196
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	25,711	27,306
Carrying Value / Fair Value of Assets	407	478
Derivative Liability, Fair Value, Gross Liability	867	949
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	1,796	1,609
Carrying Value / Fair Value of Assets	6	4
Derivative Liability, Fair Value, Gross Liability	4	3
Not Designated as Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	1,142	809
Derivative Asset, Subject to Master Netting Arrangement, after Offset	55	36
Derivative Liability, Subject to Master Netting Arrangement, after Offset	1	0
Not Designated as Hedging Instrument | Financial Futures
Derivative [Line Items]
Notional Amount	225	255
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	468
Carrying Value / Fair Value of Assets	7	11
Derivative Liability, Fair Value, Gross Liability	3	3
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts
Derivative [Line Items]
Notional Amount	15,395	16,135
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	274	356
Derivative Liability, Fair Value, Gross Liability	454	527
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	385	415
Not Designated as Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	150	150
Derivative Asset, Subject to Master Netting Arrangement, after Offset	35	27
Derivative Liability, Subject to Master Netting Arrangement, after Offset	0	0
Not Designated as Hedging Instrument | Interest Rate Swaption
Derivative [Line Items]
Notional Amount	2,266	5,555
Carrying Value / Fair Value of Assets	0	7
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Total Return Swap
Derivative [Line Items]
Notional Amount	1,075	500
Carrying Value / Fair Value of Assets	21	24
Derivative Liability, Fair Value, Gross Liability	17	0
Not Designated as Hedging Instrument | Interest Rate Future
Derivative [Line Items]
Notional Amount	0	97
Carrying Value / Fair Value of Assets	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Foreign Exchange Option
Derivative [Line Items]
Notional Amount	350	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	2	0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	0	0
Not Designated as Hedging Instrument | Equity Option
Derivative [Line Items]
Notional Amount	141	253
Carrying Value / Fair Value of Assets	2	8
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Credit Default Swaps
Derivative [Line Items]
Notional Amount	2,726	1,475
Carrying Value / Fair Value of Assets	5	5
Derivative Liability, Fair Value, Gross Liability	3	1
Designated As Hedging Instrument
Derivative [Line Items]
Notional Amount	8,283	4,798
Derivative Asset, Subject to Master Netting Arrangement, after Offset	137	32
Derivative Liability, Subject to Master Netting Arrangement, after Offset	259	247
Designated As Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	3,269	1,770
Derivative Asset, Subject to Master Netting Arrangement, after Offset	89	9
Derivative Liability, Subject to Master Netting Arrangement, after Offset	78	86
Designated As Hedging Instrument | Foreign Currency Forwards
Derivative [Line Items]
Notional Amount	1,315	1,143
Derivative Asset, Subject to Master Netting Arrangement, after Offset	4	5
Derivative Liability, Subject to Master Netting Arrangement, after Offset	9	17
Designated As Hedging Instrument | Currency Swap [Member]
Derivative [Line Items]
Notional Amount	2,026	809
Derivative Asset, Subject to Master Netting Arrangement, after Offset	37	7
Derivative Liability, Subject to Master Netting Arrangement, after Offset	71	64
Designated As Hedging Instrument | Forward Contracts [Member]
Derivative [Line Items]
Notional Amount	1,673	1,076
Derivative Asset, Subject to Master Netting Arrangement, after Offset	7	11
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 101	$ 80