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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 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 28,018,741 | $ 23,956,444
Derivative instruments | 180,649 | 731,113
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 5,415,765 | 2,114,812
Derivative instruments | 33,313 | 62,932
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,816,999 | 4,083,259
Derivative instruments | 30,954 | 135,609
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,749,912 | 1,321,136
Derivative instruments | 15,409 | 42,644
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,314,018 | 3,190,204
Derivative instruments | 6,834 | 96,759
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,517,315 | 2,354,811
Derivative instruments | 8,875 | 75,381
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,733,406 | 2,682,960
Derivative instruments | 1,537 | 64,028
HSBC [Member] |  |
Derivative [Line Items] |  |
Notional amount | 0 | 38,599
Derivative instruments | 0 | 1,767
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 703,532 | 401,804
Derivative instruments | 2,309 | 13,488
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,622,471 | 2,605,687
Derivative instruments | 19,178 | 77,106
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,265,389 | 1,364,362
Derivative instruments | 22,342 | 41,717
SunTrust [Member] |  |
Derivative [Line Items] |  |
Notional amount | 836,304 | 248,622
Derivative instruments | 4,096 | 5,405
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 4,043,630 | 3,550,188
Derivative instruments | $ 35,802 | $ 114,277

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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 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 2: 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=34720828&loc=SL20225862-175312 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=36459792&loc=SL20226000-175313 + Details
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