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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 38,938,332 | $ 40,047,196
Fair value | 874,741 | 1,355,989
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 2,534,503 | 2,680,543
Fair value | 59,082 | 80,692
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 6,222,261 | 5,753,868
Fair value | 234,710 | 217,536
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 5,076,462 | 4,110,525
Fair value | 169,396 | 154,917
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 3,683,100 | 4,075,544
Fair value | 50,058 | 109,046
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 3,475,584 | 4,526,414
Fair value | 31,566 | 116,659
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 4,016,877 | 4,703,234
Fair value | 25,190 | 151,651
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 2,871,578 | 1,886,995
Fair value | 26,384 | 41,253
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 1,440,582 | 2,565,202
Fair value | 31,525 | 101,511
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 1,612,361 | 3,280,286
Fair value | 14,632 | 139,101
Truist |  |
Derivative [Line Items] |  |
Notional amount | 2,579,446 | 2,051,229
Fair value | 77,930 | 74,910
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 5,251,699 | 4,221,408
Fair value | 151,799 | 163,520
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 173,879 | 191,948
Fair value | $ 2,469 | $ 5,193

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