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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 40,221,513 | $ 40,091,353
Fair value | 640,578 | 1,276,574
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 3,392,015 | 3,556,256
Fair value | 25,419 | 99,229
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 4,021,050 | 4,213,658
Fair value | 96,179 | 157,865
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 3,496,022 | 3,956,329
Fair value | 78,800 | 141,540
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 2,573,024 | 3,190,833
Fair value | 16,407 | 115,860
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 3,655,865 | 3,716,868
Fair value | 40,370 | 113,295
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 5,181,335 | 4,482,832
Fair value | 47,659 | 105,899
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 2,911,156 | 2,223,743
Fair value | 11,199 | 47,950
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 4,247,259 | 3,567,972
Fair value | 85,839 | 100,472
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 2,373,286 | 2,548,072
Fair value | 39,953 | 86,494
Truist |  |
Derivative [Line Items] |  |
Notional amount | 2,170,979 | 2,547,808
Fair value | 52,640 | 94,924
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 5,917,801 | 5,820,381
Fair value | 141,532 | 206,403
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 281,721 | 266,601
Fair value | $ 4,581 | $ 6,643

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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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