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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 40,016,230 | $ 40,047,196
Fair value | 207,265 | 1,355,989
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 2,025,121 | 2,680,543
Fair value | 5,291 | 80,692
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 6,074,493 | 5,753,868
Fair value | 61,394 | 217,536
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 3,945,969 | 4,110,525
Fair value | 37,967 | 154,917
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 3,639,640 | 4,075,544
Fair value | 2,823 | 109,046
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 5,042,247 | 4,526,414
Fair value | 4,697 | 116,659
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 5,012,755 | 4,703,234
Fair value | 7,464 | 151,651
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 1,931,969 | 1,886,995
Fair value | 3,180 | 41,253
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 2,197,796 | 2,565,202
Fair value | 18,753 | 101,511
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 2,795,508 | 3,280,286
Fair value | 13,928 | 139,101
SunTrust |  |
Derivative [Line Items] |  |
Notional amount | 2,212,338 | 2,051,229
Fair value | 16,438 | 74,910
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 4,942,226 | 4,221,408
Fair value | 34,628 | 163,520
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 196,168 | 191,948
Fair value | $ 702 | $ 5,193

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