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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 49,059 | $ 35,830
Carrying Value / Fair Value of Assets | 611 | 187
Derivative Liability, Fair Value, Gross Liability | 806 | 550
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 914 | 470
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 1,643 | 1,323
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 38,223 | 26,500
Carrying Value / Fair Value of Assets | 836 | 364
Derivative Liability, Fair Value, Gross Liability | 1,159 | 855
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,940 | 1,848
Carrying Value / Fair Value of Assets | 5 | 6
Derivative Liability, Fair Value, Gross Liability | 12 | 20
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 1,325 | 1,148
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 1 | 9
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 24 | 37
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 208 | 209
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 | 408 | 408
Carrying Value / Fair Value of Assets | 2 | 6
Derivative Liability, Fair Value, Gross Liability | 5 | 2
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 17,117 | 15,362
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 | 303 | 283
Derivative Liability, Fair Value, Gross Liability | 399 | 338
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 | 438 | 435
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 150 | 150
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 43 | 47
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 0 | 0
Not Designated as Hedging Instrument | Interest Rate Swaption |  |
Derivative [Line Items] |  |
Notional Amount | 750 | 1,773
Carrying Value / Fair Value of Assets | 1 | 1
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Total Return Swap |  |
Derivative [Line Items] |  |
Notional Amount | 606 | 956
Carrying Value / Fair Value of Assets | 5 | 0
Derivative Liability, Fair Value, Gross Liability | 5 | 14
Not Designated as Hedging Instrument | Foreign Exchange Option |  |
Derivative [Line Items] |  |
Notional Amount | 430 | 430
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 0 | 1
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 0 | 0
Not Designated as Hedging Instrument | Equity Option |  |
Derivative [Line Items] |  |
Notional Amount | 5,576 | 255
Carrying Value / Fair Value of Assets | 465 | 5
Derivative Liability, Fair Value, Gross Liability | 258 | 1
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 6,238 | 2,661
Carrying Value / Fair Value of Assets | 7 | 4
Derivative Liability, Fair Value, Gross Liability | 15 | 6
Not Designated as Hedging Instrument | Credit Default Option |  |
Derivative [Line Items] |  |
Notional Amount | 2,200 | 0
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 0 | 0
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 0 | 0
Not Designated as Hedging Instrument | Swap |  |
Derivative [Line Items] |  |
Notional Amount | 1,275 | 1,300
Carrying Value / Fair Value of Assets | 4 | 2
Derivative Liability, Fair Value, Gross Liability | 3 | 2
Designated As Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 10,836 | 9,330
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 78 | 106
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 484 | 468
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 3,374 | 3,336
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 39 | 5
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 55 | 103
Designated As Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 2,266 | 1,966
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 20 | 94
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 32 | 0
Designated As Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 2,008 | 2,008
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 6 | 7
Derivative Liability, Subject to Master Netting Arrangement, after Offset | 194 | 159
Designated As Hedging Instrument | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 3,188 | 2,020
Derivative Asset, Subject to Master Netting Arrangement, after Offset | 13 | 0
Derivative Liability, Subject to Master Netting Arrangement, after Offset | $ 203 | $ 206

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