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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, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |
Notional amount | $ 18,165,164 | $ 15,623,505
Derivative instruments | 625,236 | 415,258
Bank of America [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,273,995 | 568,786
Derivative instruments | 47,681 | 16,533
Barclays [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,936,023 | 3,463,777
Derivative instruments | 108,872 | 103,929
BNP Paribas [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,481,037 | 2,207,097
Derivative instruments | 45,958 | 60,301
Citibank, N.A. [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,368,136 | 2,878,588
Derivative instruments | 47,915 | 67,592
Credit Suisse [Member] |  |
Derivative [Line Items] |  |
Notional amount | 3,886,014 | 936,625
Derivative instruments | 116,310 | 21,518
Deutsche Bank [Member] |  |
Derivative [Line Items] |  |
Notional amount | 909,823 | 886,688
Derivative instruments | 37,627 | 20,787
HSBC [Member] |  |
Derivative [Line Items] |  |
Notional amount | 235,430 | 295,520
Derivative instruments | 12,415 | 6,539
J.P. Morgan [Member] |  |
Derivative [Line Items] |  |
Notional amount | 778,891 | 735,016
Derivative instruments | 21,204 | 21,940
Morgan Stanley [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,713,249 | 1,590,505
Derivative instruments | 89,525 | 40,113
Royal Bank of Canada [Member] |  |
Derivative [Line Items] |  |
Notional amount | 298,349 | 0
Derivative instruments | 5,862 | 0
Wells Fargo [Member] |  |
Derivative [Line Items] |  |
Notional amount | 2,284,217 | 2,060,903
Derivative instruments | $ 91,867 | $ 56,006

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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 of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=7476318&loc=SL5624163-113959 + Details
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