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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Document Period End Date Jun. 30, 2021  
Notional Amount $ 24,229 $ 23,298
Carrying Value / Fair Value of Assets 301 229
Derivative Liability, Fair Value, Gross Liability 955 987
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount 21,420 21,007
Carrying Value / Fair Value of Assets 277 208
Derivative Liability, Fair Value, Gross Liability 903 947
Not Designated as Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 1,089 1,084
Carrying Value / Fair Value of Assets 74 93
Derivative Liability, Fair Value, Gross Liability 1 1
Not Designated as Hedging Instrument | Financial Futures    
Derivative [Line Items]    
Notional Amount 254 258
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 459 347
Carrying Value / Fair Value of Assets 1 4
Derivative Liability, Fair Value, Gross Liability 4 2
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Derivative [Line Items]    
Notional Amount 607 612
Carrying Value / Fair Value of Assets 19 11
Derivative Liability, Fair Value, Gross Liability 11 19
Not Designated as Hedging Instrument | Credit Default Swaps    
Derivative [Line Items]    
Notional Amount 1,893 1,517
Carrying Value / Fair Value of Assets 36 13
Derivative Liability, Fair Value, Gross Liability 1 0
Not Designated as Hedging Instrument | Equity Options    
Derivative [Line Items]    
Notional Amount 479 395
Carrying Value / Fair Value of Assets 23 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 0 0
Derivative Liability, Fair Value, Gross Liability 6 18
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 124 58
Derivative Liability, Fair Value, Gross Liability 0 0
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 726 752
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 154 155
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts    
Derivative [Line Items]    
Notional Amount 16,489 16,644
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 2,809 2,291
Carrying Value / Fair Value of Assets 24 21
Derivative Liability, Fair Value, Gross Liability 52 40
Designated As Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 920 802
Carrying Value / Fair Value of Assets 5 3
Derivative Liability, Fair Value, Gross Liability 27 24
Designated As Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 1,327 1,255
Carrying Value / Fair Value of Assets 9 10
Derivative Liability, Fair Value, Gross Liability 24 15
Designated As Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 193 234
Carrying Value / Fair Value of Assets 3 8
Derivative Liability, Fair Value, Gross Liability 1 1
Designated As Hedging Instrument | Purchase Commitment    
Derivative [Line Items]    
Notional Amount 369 0
Carrying Value / Fair Value of Assets 7 0
Derivative Liability, Fair Value, Gross Liability $ 0 $ 0