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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Notional amount $ 40,177,608 $ 39,420,777
Fair value 963,081 205,149
Bank of America    
Derivative [Line Items]    
Notional amount 3,938,470 6,518,808
Fair value 46,637 6,704
Barclays    
Derivative [Line Items]    
Notional amount 4,549,168 2,301,414
Fair value 141,155 27,032
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 4,321,739 4,856,150
Fair value 126,868 29,313
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 4,064,075 4,792,208
Fair value 83,451 27,239
Credit Suisse    
Derivative [Line Items]    
Notional amount 4,739,536 2,877,916
Fair value 77,910 12,887
J.P. Morgan    
Derivative [Line Items]    
Notional amount 4,772,783 3,701,964
Fair value 101,072 17,564
Morgan Stanley    
Derivative [Line Items]    
Notional amount 1,990,733 3,560,044
Fair value 21,001 1,561
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 2,720,343 1,871,305
Fair value 82,946 14,011
Societe Generale    
Derivative [Line Items]    
Notional amount 3,205,393 2,343,165
Fair value 106,016 21,681
SunTrust    
Derivative [Line Items]    
Notional amount 2,017,444 1,755,030
Fair value 58,986 12,047
Wells Fargo    
Derivative [Line Items]    
Notional amount 3,656,074 4,618,569
Fair value 112,408 33,398
Exchange Traded    
Derivative [Line Items]    
Notional amount 201,850 224,204
Fair value $ 4,631 $ 1,712