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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional amount	$ 38,890,372	$ 35,498,003
Derivative instruments	1,290,387	1,568,380
Bank of America
Derivative [Line Items]
Notional amount	6,215,626	4,645,366
Derivative instruments	214,380	237,955
Barclays
Derivative [Line Items]
Notional amount	2,509,716	4,135,537
Derivative instruments	76,397	154,127
BNP Paribas
Derivative [Line Items]
Notional amount	0	1,411,989
Derivative instruments	0	73,650
Canadian Imperial Bank of Commerce
Derivative [Line Items]
Notional amount	5,200,352	2,808,030
Derivative instruments	173,803	84,268
Citibank, N.A.
Derivative [Line Items]
Notional amount	4,904,171	4,104,666
Derivative instruments	176,825	219,900
Credit Suisse
Derivative [Line Items]
Notional amount	2,640,799	3,538,855
Derivative instruments	62,867	137,384
J.P. Morgan
Derivative [Line Items]
Notional amount	3,225,810	1,753,649
Derivative instruments	116,332	109,689
Morgan Stanley
Derivative [Line Items]
Notional amount	3,941,705	3,408,179
Derivative instruments	124,691	184,323
Royal Bank of Canada
Derivative [Line Items]
Notional amount	1,942,305	3,027,469
Derivative instruments	67,105	104,141
Societe Generale
Derivative [Line Items]
Notional amount	1,769,787	0
Derivative instruments	53,835	0
SunTrust
Derivative [Line Items]
Notional amount	1,644,816	2,331,168
Derivative instruments	54,149	90,399
Wells Fargo
Derivative [Line Items]
Notional amount	4,659,622	4,036,255
Derivative instruments	163,569	162,781
Exchange Traded
Derivative [Line Items]
Notional amount	235,663	296,840
Derivative instruments	$ 6,434	$ 9,763

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://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=84234895&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=82849420&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=82924980&loc=SL51823488-111719

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- Definition

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