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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

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