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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 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 33,259,347 | $ 31,048,082
Derivative instruments | 1,086,624 | 830,519
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 5,020,592 | 5,958,884
Derivative instruments | 179,048 | 178,477
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,760,675 | 3,441,832
Derivative instruments | 103,317 | 89,721
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,837,242 | 1,199,265
Derivative instruments | 48,330 | 19,598
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,791,993 | 4,038,528
Derivative instruments | 155,815 | 97,094
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,721,586 | 2,130,710
Derivative instruments | 92,577 | 44,242
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 0 | 25,935
Derivative instruments | 0 | 892
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,622,559 | 1,785,583
Derivative instruments | 53,359 | 19,645
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,795,503 | 2,543,421
Derivative instruments | 104,024 | 64,425
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,167,888 | 3,384,310
Derivative instruments | 104,644 | 103,510
SunTrust [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,147,079 | 2,375,418
Derivative instruments | 101,690 | 72,990
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,986,928 | 3,850,842
Derivative instruments | 131,676 | 130,545
Exchange Traded [Member] |  |
Derivative [Line Items] |  |
Notional amount | 407,302 | 313,354
Derivative instruments | $ 12,144 | $ 9,380

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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=64837297&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=64830801&loc=SL51823488-111719 + Details
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