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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Notional amount $ 39,073,075 $ 39,362,179
Fair value 1,459,754 1,310,954
Bank of America    
Derivative [Line Items]    
Notional amount 3,076,674 2,835,420
Fair value 115,369 95,378
Barclays    
Derivative [Line Items]    
Notional amount 5,049,615 5,710,978
Fair value 189,275 277,692
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 6,490,068 6,593,815
Fair value 285,734 279,053
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 3,023,360 3,118,979
Fair value 103,218 96,757
Credit Suisse    
Derivative [Line Items]    
Notional amount 4,470,605 4,422,798
Fair value 155,377 78,823
J.P. Morgan    
Derivative [Line Items]    
Notional amount 2,837,898 3,600,636
Fair value 80,767 54,762
Morgan Stanley    
Derivative [Line Items]    
Notional amount 1,717,891 2,856,466
Fair value 86,303 62,969
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 1,636,841 1,289,699
Fair value 43,232 32,753
Societe Generale    
Derivative [Line Items]    
Notional amount 2,670,574 1,494,904
Fair value 91,939 34,394
Truist    
Derivative [Line Items]    
Notional amount 2,409,885 2,375,124
Fair value 98,081 96,573
Wells Fargo    
Derivative [Line Items]    
Notional amount 5,417,625 4,848,541
Fair value 202,896 196,801
Exchange Traded    
Derivative [Line Items]    
Notional amount 272,039 214,819
Fair value $ 7,563 $ 4,999