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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional amount	$ 38,497,059	$ 39,362,179
Fair value	1,509,767	1,310,954
Bank of America
Derivative [Line Items]
Notional amount	2,919,169	2,835,420
Fair value	113,973	95,378
Barclays
Derivative [Line Items]
Notional amount	5,769,640	5,710,978
Fair value	260,349	277,692
Canadian Imperial Bank of Commerce
Derivative [Line Items]
Notional amount	6,784,340	6,593,815
Fair value	300,773	279,053
Citibank, N.A.
Derivative [Line Items]
Notional amount	3,476,223	3,118,979
Fair value	142,248	96,757
Credit Suisse
Derivative [Line Items]
Notional amount	3,463,465	4,422,798
Fair value	107,932	78,823
J.P. Morgan
Derivative [Line Items]
Notional amount	3,060,678	3,600,636
Fair value	95,835	54,762
Morgan Stanley
Derivative [Line Items]
Notional amount	2,464,800	2,856,466
Fair value	97,684	62,969
Royal Bank of Canada
Derivative [Line Items]
Notional amount	1,201,793	1,289,699
Fair value	31,085	32,753
Societe Generale
Derivative [Line Items]
Notional amount	1,811,079	1,494,904
Fair value	56,516	34,394
Truist
Derivative [Line Items]
Notional amount	2,356,648	2,375,124
Fair value	96,021	96,573
Wells Fargo
Derivative [Line Items]
Notional amount	4,966,960	4,848,541
Fair value	201,085	196,801
Exchange Traded
Derivative [Line Items]
Notional amount	222,264	214,819
Fair value	$ 6,266	$ 4,999

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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- Definition

Nominal or face amount used to calculate payment on derivative.

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