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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

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