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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 | $ 478,384 | $ 445,049
Assets | 14,379 | 23,273
Liabilities | (20,356) | (18,267)
Embedded Derivative, Fair Value of Embedded Derivative, Net | (12,907) | (20,119)
Derivatives Designated as Hedge Accounting Instruments: |  |
Derivative [Line Items] |  |
Notional | 28,810 | 28,533
Assets | 1,501 | 1,924
Liabilities | (1,114) | (1,251)
Derivatives Designated as Hedge Accounting Instruments: | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional | 3,015 | 3,065
Assets | 601 | 978
Liabilities | (69) | (90)
Derivatives Designated as Hedge Accounting Instruments: | Interest Rate Forwards |  |
Derivative [Line Items] |  |
Notional | 298 | 249
Assets | 0 | 0
Liabilities | (37) | (8)
Derivatives Designated as Hedge Accounting Instruments: | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional | 2,666 | 2,577
Assets | 79 | 68
Liabilities | (133) | (116)
Derivatives Designated as Hedge Accounting Instruments: | Foreign Currency Swaps |  |
Derivative [Line Items] |  |
Notional | 22,831 | 22,642
Assets | 821 | 878
Liabilities | (875) | (1,037)
Derivatives Not Qualifying as Hedge Accounting Instruments: |  |
Derivative [Line Items] |  |
Notional | 449,574 | 416,516
Assets | 12,878 | 21,349
Liabilities | (19,242) | (17,016)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional | 210,809 | 178,803
Assets | 9,956 | 17,174
Liabilities | (16,035) | (13,172)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Forwards |  |
Derivative [Line Items] |  |
Notional | 2,974 | 2,910
Assets | 36 | 25
Liabilities | (24) | 0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional | 33,199 | 35,478
Assets | 989 | 764
Liabilities | (1,110) | (647)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Foreign Currency Options |  |
Derivative [Line Items] |  |
Notional | 0 | 0
Assets | 0 | 0
Liabilities | 0 | 0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Foreign Currency Swaps |  |
Derivative [Line Items] |  |
Notional | 13,567 | 13,661
Assets | 626 | 537
Liabilities | (418) | (601)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Futures |  |
Derivative [Line Items] |  |
Notional | 17,570 | 15,778
Assets | 14 | 99
Liabilities | (65) | (5)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Options |  |
Derivative [Line Items] |  |
Notional | 15,318 | 14,593
Assets | 417 | 914
Liabilities | (226) | (233)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional | 2,305 | 3,360
Assets | 50 | 63
Liabilities | 0 | (28)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity Futures |  |
Derivative [Line Items] |  |
Notional | 5,195 | 5,668
Assets | 24 | 10
Liabilities | (3) | (25)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity Options |  |
Derivative [Line Items] |  |
Notional | 42,374 | 36,250
Assets | 664 | 1,731
Liabilities | (921) | (1,028)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Total Return Swap |  |
Derivative [Line Items] |  |
Notional | 19,731 | 22,489
Assets | 102 | 32
Liabilities | (440) | (1,277)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Other |  |
Derivative [Line Items] |  |
Notional | 1,259 | 1,262
Assets | 0 | 0
Liabilities | 0 | 0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Synthetic Gics |  |
Derivative [Line Items] |  |
Notional | 85,273 | 86,264
Assets | 0 | 0
Liabilities | $ 0 | $ 0

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