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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional amount	$ 39,704,314	$ 39,420,777
Fair value	755,866	205,149
Bank of America
Derivative [Line Items]
Notional amount	5,641,352	6,518,808
Fair value	57,470	6,704
Barclays
Derivative [Line Items]
Notional amount	3,068,667	2,301,414
Fair value	83,334	27,032
Canadian Imperial Bank of Commerce
Derivative [Line Items]
Notional amount	4,462,047	4,856,150
Fair value	94,054	29,313
Citibank, N.A.
Derivative [Line Items]
Notional amount	5,059,808	4,792,208
Fair value	100,240	27,239
Credit Suisse
Derivative [Line Items]
Notional amount	2,532,127	2,877,916
Fair value	42,045	12,887
J.P. Morgan
Derivative [Line Items]
Notional amount	4,088,686	3,701,964
Fair value	73,386	17,564
Morgan Stanley
Derivative [Line Items]
Notional amount	3,551,302	3,560,044
Fair value	22,463	1,561
Royal Bank of Canada
Derivative [Line Items]
Notional amount	2,176,990	1,871,305
Fair value	55,006	14,011
Societe Generale
Derivative [Line Items]
Notional amount	3,030,360	2,343,165
Fair value	77,099	21,681
SunTrust
Derivative [Line Items]
Notional amount	1,717,542	1,755,030
Fair value	39,042	12,047
Wells Fargo
Derivative [Line Items]
Notional amount	4,102,362	4,618,569
Fair value	106,838	33,398
Exchange Traded
Derivative [Line Items]
Notional amount	273,071	224,204
Fair value	$ 4,889	$ 1,712

X

- 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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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