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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Notional amount $ 40,077,765 $ 39,420,777
Fair value 888,208 205,149
Bank of America    
Derivative [Line Items]    
Notional amount 4,746,939 6,518,808
Fair value 65,234 6,704
Barclays    
Derivative [Line Items]    
Notional amount 3,676,868 2,301,414
Fair value 112,900 27,032
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 4,425,609 4,856,150
Fair value 108,664 29,313
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 4,334,274 4,792,208
Fair value 86,699 27,239
Credit Suisse    
Derivative [Line Items]    
Notional amount 3,245,604 2,877,916
Fair value 52,975 12,887
J.P. Morgan    
Derivative [Line Items]    
Notional amount 4,523,782 3,701,964
Fair value 88,479 17,564
Morgan Stanley    
Derivative [Line Items]    
Notional amount 2,722,332 3,560,044
Fair value 20,570 1,561
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 2,324,001 1,871,305
Fair value 66,682 14,011
Societe Generale    
Derivative [Line Items]    
Notional amount 3,813,118 2,343,165
Fair value 112,213 21,681
SunTrust    
Derivative [Line Items]    
Notional amount 1,946,818 1,755,030
Fair value 49,216 12,047
Wells Fargo    
Derivative [Line Items]    
Notional amount 4,118,239 4,618,569
Fair value 120,212 33,398
Exchange Traded    
Derivative [Line Items]    
Notional amount 200,181 224,204
Fair value $ 4,364 $ 1,712