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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 39,704,314 | $ 39,420,777
Fair value | 755,866 | 205,149
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 5,641,352 | 6,518,808
Fair value | 57,470 | 6,704
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 3,068,667 | 2,301,414
Fair value | 83,334 | 27,032
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 4,462,047 | 4,856,150
Fair value | 94,054 | 29,313
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 5,059,808 | 4,792,208
Fair value | 100,240 | 27,239
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 2,532,127 | 2,877,916
Fair value | 42,045 | 12,887
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 4,088,686 | 3,701,964
Fair value | 73,386 | 17,564
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 3,551,302 | 3,560,044
Fair value | 22,463 | 1,561
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 2,176,990 | 1,871,305
Fair value | 55,006 | 14,011
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 3,030,360 | 2,343,165
Fair value | 77,099 | 21,681
SunTrust |  |
Derivative [Line Items] |  |
Notional amount | 1,717,542 | 1,755,030
Fair value | 39,042 | 12,047
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 4,102,362 | 4,618,569
Fair value | 106,838 | 33,398
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 273,071 | 224,204
Fair value | $ 4,889 | $ 1,712

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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://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 2: 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=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: 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=109980867&loc=SL5624163-113959 + Details
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