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Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | $ 182,504 |
Interest Rate Contracts [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 123,248 |
Foreign currency contracts [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 3,078 |
Equity market contracts [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 55,784 |
Credit contracts [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 394 |
Total Derivative Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 182,504 | $ 163,315
Asset Fair Value | 7,324 | 4,384
Liability Fair Value | 8,431 | 4,306
Derivative Investments [Member] | Interest Rate Contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 119,681 | 112,921
Asset Fair Value | 1,890 | 1,082
Liability Fair Value | 140 | 219
Derivative Investments [Member] | Foreign currency contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 166 | 262
Asset Fair Value | 11 | 1
Liability Fair Value |  | 3
Derivative Investments [Member] | Equity market contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 55,784 | 43,555
Asset Fair Value | 2,819 | 1,442
Liability Fair Value | 1,112 | 664
Derivative Investments [Member] | Credit contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 394 | 55
Derivative Investments [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 5,309 | 5,261
Asset Fair Value | 940 | 299
Liability Fair Value | 866 | 296
Derivative Investments [Member] | Cash Flow Hedges [Member] | Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 2,397 | 2,387
Asset Fair Value | 334 | 108
Liability Fair Value | 853 | 245
Derivative Investments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 2,912 | 2,874
Asset Fair Value | 606 | 191
Liability Fair Value | 13 | 51
Derivative Investments [Member] | Fair Value Hedges [Member] | Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Notional Amounts | 1,170 | 1,261
Asset Fair Value |  | 123
Liability Fair Value | 337 | 203
Other Assets [Member] | GLB Direct Embedded Derivatives [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Asset Fair Value |  | 450
Liability Fair Value | 4,596 |
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Asset Fair Value | 728 | 60
Liability Fair Value |  | 9
Reinsurance Related Embedded Derivatives [Member] | Reinsurance Related [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Asset Fair Value | 137 |
Liability Fair Value |  | 327
Future Contract Benefits [Member] | Indexed Annuity And IUL Contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] |  |
Outstanding derivative instruments with off-balance-sheet risks |  |
Asset Fair Value | 799 | 927
Liability Fair Value | $ 1,380 | $ 2,585

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