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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

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