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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 23,577 | $ 23,298
Carrying Value / Fair Value of Assets | 268 | 229
Derivative Liability, Fair Value, Gross Liability | 943 | 987
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 21,230 | 21,007
Carrying Value / Fair Value of Assets | 255 | 208
Derivative Liability, Fair Value, Gross Liability | 893 | 947
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,107 | 1,084
Carrying Value / Fair Value of Assets | 67 | 93
Derivative Liability, Fair Value, Gross Liability | 3 | 1
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 285 | 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 | 475 | 347
Carrying Value / Fair Value of Assets | 2 | 4
Derivative Liability, Fair Value, Gross Liability | 10 | 2
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 627 | 612
Carrying Value / Fair Value of Assets | 19 | 11
Derivative Liability, Fair Value, Gross Liability | 12 | 19
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,720 | 1,517
Carrying Value / Fair Value of Assets | 32 | 13
Derivative Liability, Fair Value, Gross Liability | 3 | 0
Not Designated as Hedging Instrument | Equity Options |  |
Derivative [Line Items] |  |
Notional Amount | 443 | 395
Carrying Value / Fair Value of Assets | 26 | 29
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 16,423 | 16,644
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 | 109 | 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 | 720 | 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 | 136 | 155
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 | 9 | 18
Designated As Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 2,347 | 2,291
Carrying Value / Fair Value of Assets | 13 | 21
Derivative Liability, Fair Value, Gross Liability | 50 | 40
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 878 | 802
Carrying Value / Fair Value of Assets | 2 | 3
Derivative Liability, Fair Value, Gross Liability | 24 | 24
Designated As Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 214 | 234
Carrying Value / Fair Value of Assets | 6 | 8
Derivative Liability, Fair Value, Gross Liability | 1 | 1
Designated As Hedging Instrument | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 1,141 | 1,255
Carrying Value / Fair Value of Assets | 5 | 10
Derivative Liability, Fair Value, Gross Liability | 18 | 15
Designated As Hedging Instrument | Other Contract |  |
Derivative [Line Items] |  |
Notional Amount | 114 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | $ 7 | $ 0

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