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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Document Period End Date Sep. 30, 2020  
Notional Amount $ 22,071 $ 19,446
Carrying Value / Fair Value of Assets 217 258
Derivative Liability, Fair Value, Gross Liability 1,074 1,003
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount 20,053 17,475
Carrying Value / Fair Value of Assets 159 212
Derivative Liability, Fair Value, Gross Liability 1,035 970
Not Designated as Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 1,162 909
Carrying Value / Fair Value of Assets 102 70
Derivative Liability, Fair Value, Gross Liability 4 3
Not Designated as Hedging Instrument | Financial Futures    
Derivative [Line Items]    
Notional Amount 322 307
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 297 175
Carrying Value / Fair Value of Assets 3 1
Derivative Liability, Fair Value, Gross Liability 1 0
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Derivative [Line Items]    
Notional Amount 573 441
Carrying Value / Fair Value of Assets 10 0
Derivative Liability, Fair Value, Gross Liability 33 28
Not Designated as Hedging Instrument | Credit Default Swaps    
Derivative [Line Items]    
Notional Amount 1,307 1,306
Carrying Value / Fair Value of Assets 3 5
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Equity Options    
Derivative [Line Items]    
Notional Amount 361 364
Carrying Value / Fair Value of Assets 34 15
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 17 9
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 7 121
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 767 767
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 213 163
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts    
Derivative [Line Items]    
Notional Amount 15,881 13,823
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 2,018 1,971
Carrying Value / Fair Value of Assets 58 46
Derivative Liability, Fair Value, Gross Liability 39 33
Designated As Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 625 535
Carrying Value / Fair Value of Assets 2 1
Derivative Liability, Fair Value, Gross Liability 34 29
Designated As Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 1,140 1,094
Carrying Value / Fair Value of Assets 48 28
Derivative Liability, Fair Value, Gross Liability 0 2
Designated As Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 253 342
Carrying Value / Fair Value of Assets 8 17
Derivative Liability, Fair Value, Gross Liability $ 5 $ 2