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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

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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