v3.26.1
Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative [Line Items]    
Notional Amount $ 53,200 $ 48,654
Carrying Value / Fair Value of Assets 706 850
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 1,591 1,800
Derivative Fair Value Of Free Standing Derivative Asset 434 578
Derivative Liability, Fair Value, Gross Liability 897 989
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount 40,598 37,677
Carrying Value / Fair Value of Assets 638 794
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 913 1,148
Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative [Line Items]    
Notional Amount 2,370 2,088
Carrying Value / Fair Value of Assets 5 5
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 15 14
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 1,451 1,358
Carrying Value / Fair Value of Assets 2 1
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 49 53
Not Designated as Hedging Instrument | Financial Futures    
Derivative [Line Items]    
Notional Amount 203 200
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 0 0
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Derivative [Line Items]    
Notional Amount 389 395
Carrying Value / Fair Value of Assets 7 2
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 3 7
Not Designated as Hedging Instrument | Credit Default Swaps    
Derivative [Line Items]    
Notional Amount 8,073 6,573
Carrying Value / Fair Value of Assets 16 3
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 14 10
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts    
Derivative [Line Items]    
Notional Amount 16,923 17,209
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 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 272 272
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 297 341
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, Subject to Master Netting Arrangement, before Offset of Collateral 397 470
Not Designated as Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 150 150
Carrying Value / Fair Value of Assets 48 48
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 0 0
Not Designated as Hedging Instrument | Interest Rate Swaption    
Derivative [Line Items]    
Notional Amount 1,000 750
Carrying Value / Fair Value of Assets 1 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 0 0
Not Designated as Hedging Instrument | Total Return Swap    
Derivative [Line Items]    
Notional Amount 581 527
Carrying Value / Fair Value of Assets 0 1
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 13 5
Not Designated as Hedging Instrument | Equity Option    
Derivative [Line Items]    
Notional Amount 5,988 5,897
Carrying Value / Fair Value of Assets 285 459
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 123 245
Not Designated as Hedging Instrument | Foreign Exchange Option    
Derivative [Line Items]    
Notional Amount 305 305
Derivative Fair Value Of Free Standing Derivative Asset 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Swap    
Derivative [Line Items]    
Notional Amount 1,165 1,225
Derivative Fair Value Of Free Standing Derivative Asset 2 3
Derivative Liability, Fair Value, Gross Liability 2 3
Not Designated as Hedging Instrument | Credit Default Option    
Derivative [Line Items]    
Notional Amount 2,000 1,000
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 0 0
Designated As Hedging Instrument    
Derivative [Line Items]    
Notional Amount 12,602 10,977
Carrying Value / Fair Value of Assets 68 56
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 678 652
Designated As Hedging Instrument | Interest Rate Swaps    
Derivative [Line Items]    
Notional Amount 3,676 3,641
Carrying Value / Fair Value of Assets 20 31
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 50 56
Designated As Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 2,284 2,270
Carrying Value / Fair Value of Assets 38 12
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 16 38
Designated As Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 1,954 2,008
Carrying Value / Fair Value of Assets 8 8
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral 360 331
Designated As Hedging Instrument | Forward Contracts [Member]    
Derivative [Line Items]    
Notional Amount 4,688 3,058
Carrying Value / Fair Value of Assets 2 5
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral $ 252 $ 227