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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 39,362,179 | $ 40,047,196
Fair value | 1,310,954 | 1,355,989
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 2,835,420 | 2,680,543
Fair value | 95,378 | 80,692
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 5,710,978 | 5,753,868
Fair value | 277,692 | 217,536
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 6,593,815 | 4,110,525
Fair value | 279,053 | 154,917
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 3,118,979 | 4,075,544
Fair value | 96,757 | 109,046
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 4,422,798 | 4,526,414
Fair value | 78,823 | 116,659
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 3,600,636 | 4,703,234
Fair value | 54,762 | 151,651
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 2,856,466 | 1,886,995
Fair value | 62,969 | 41,253
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 1,289,699 | 2,565,202
Fair value | 32,753 | 101,511
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 1,494,904 | 3,280,286
Fair value | 34,394 | 139,101
Truist |  |
Derivative [Line Items] |  |
Notional amount | 2,375,124 | 2,051,229
Fair value | 96,573 | 74,910
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 4,848,541 | 4,221,408
Fair value | 196,801 | 163,520
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 214,819 | 191,948
Fair value | $ 4,999 | $ 5,193

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