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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 29,875,707 | $ 29,277,569
Derivative instruments | 387,469 | 337,256
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 6,697,638 | 6,257,861
Derivative instruments | 78,296 | 67,662
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,290,633 | 2,463,768
Derivative instruments | 37,769 | 35,273
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,351,337 | 1,520,710
Derivative instruments | 20,456 | 16,944
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,749,452 | 3,786,498
Derivative instruments | 23,432 | 23,587
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,610,605 | 1,278,492
Derivative instruments | 25,342 | 12,508
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,042,549 | 1,349,002
Derivative instruments | 6,063 | 10,704
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,087,115 | 838,982
Derivative instruments | 15,110 | 5,283
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,272,374 | 3,465,457
Derivative instruments | 23,861 | 33,171
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,949,467 | 2,820,410
Derivative instruments | 50,617 | 48,654
SunTrust [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,342,568 | 1,308,434
Derivative instruments | 26,269 | 20,028
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 4,481,969 | 4,187,955
Derivative instruments | $ 80,254 | $ 63,442

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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=56946850&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=51825145&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=51814546&loc=SL51823488-111719 + Details
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