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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 39,633,947 | $ 39,362,179
Fair value | 988,835 | 1,310,954
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 2,994,366 | 2,835,420
Fair value | 61,336 | 95,378
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 4,525,383 | 5,710,978
Fair value | 145,696 | 277,692
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 5,342,067 | 6,593,815
Fair value | 188,902 | 279,053
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 3,296,027 | 3,118,979
Fair value | 72,818 | 96,757
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 4,581,898 | 4,422,798
Fair value | 102,878 | 78,823
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 3,833,032 | 3,600,636
Fair value | 47,527 | 54,762
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 1,744,800 | 2,856,466
Fair value | 33,258 | 62,969
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 2,640,076 | 1,289,699
Fair value | 58,383 | 32,753
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 2,638,886 | 1,494,904
Fair value | 60,749 | 34,394
Truist |  |
Derivative [Line Items] |  |
Notional amount | 2,040,196 | 2,375,124
Fair value | 58,879 | 96,573
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 5,713,233 | 4,848,541
Fair value | 152,124 | 196,801
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 283,983 | 214,819
Fair value | $ 6,285 | $ 4,999

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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