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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 37,938,945 | $ 35,498,003
Derivative instruments | 847,243 | 1,568,380
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 5,761,669 | 4,645,366
Derivative instruments | 97,612 | 237,955
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,349,719 | 4,135,537
Derivative instruments | 80,644 | 154,127
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 362,737 | 1,411,989
Derivative instruments | 9,716 | 73,650
Canadian Imperial Bank of Commerce [Member] |  |
Derivative [Line Items] |  |
Notional amount | 5,200,796 | 2,808,030
Derivative instruments | 137,773 | 84,268
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 5,315,570 | 4,104,666
Derivative instruments | 106,135 | 219,900
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,490,747 | 3,538,855
Derivative instruments | 33,531 | 137,384
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,581,684 | 1,753,649
Derivative instruments | 67,932 | 109,689
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,823,069 | 3,408,179
Derivative instruments | 63,045 | 184,323
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,663,350 | 3,027,469
Derivative instruments | 79,509 | 104,141
Societe Generale [Member] |  |
Derivative [Line Items] |  |
Notional amount | 560,437 | 0
Derivative instruments | 13,521 | 0
SunTrust [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,586,315 | 2,331,168
Derivative instruments | 42,732 | 90,399
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,997,795 | 4,036,255
Derivative instruments | 109,827 | 162,781
Exchange Traded [Member] |  |
Derivative [Line Items] |  |
Notional amount | 245,057 | 296,840
Derivative instruments | $ 5,266 | $ 9,763

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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