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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount of Derivatives | $ 23,298 | $ 19,446
Derivative Asset, Fair Value, Gross Asset | 229 | 258
Derivative Liability, Fair Value, Gross Liability | 987 | 1,003
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 21,007 | 17,475
Derivative Asset, Fair Value, Gross Asset | 208 | 212
Derivative Liability, Fair Value, Gross Liability | 947 | 970
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,084 | 909
Derivative Asset, Fair Value, Gross Asset | 93 | 70
Derivative Liability, Fair Value, Gross Liability | 1 | 3
Not Designated as Hedging Instrument [Member] | Future [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 258 | 307
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 347 | 175
Derivative Asset, Fair Value, Gross Asset | 4 | 1
Derivative Liability, Fair Value, Gross Liability | 2 | 0
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 612 | 441
Derivative Asset, Fair Value, Gross Asset | 11 | 0
Derivative Liability, Fair Value, Gross Liability | 19 | 28
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,517 | 1,306
Derivative Asset, Fair Value, Gross Asset | 13 | 5
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Equity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 395 | 364
Derivative Asset, Fair Value, Gross Asset | 29 | 15
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 16,644 | 13,823
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 58 | 121
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 752 | 767
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Variable Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 155 | 163
Not Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 150 | 150
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 18 | 9
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 2,291 | 1,971
Derivative Asset, Fair Value, Gross Asset | 21 | 46
Derivative Liability, Fair Value, Gross Liability | 40 | 33
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 802 | 535
Derivative Asset, Fair Value, Gross Asset | 3 | 1
Derivative Liability, Fair Value, Gross Liability | 24 | 29
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,255 | 1,094
Derivative Asset, Fair Value, Gross Asset | 10 | 28
Derivative Liability, Fair Value, Gross Liability | 15 | 2
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 234 | 342
Derivative Asset, Fair Value, Gross Asset | 8 | 17
Derivative Liability, Fair Value, Gross Liability | $ 1 | $ 2

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