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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Notional amount $ 39,633,947 $ 39,362,179
Fair value 988,835 1,310,954
Bank of America    
Derivative [Line Items]    
Notional amount 2,994,366 2,835,420
Fair value 61,336 95,378
Barclays    
Derivative [Line Items]    
Notional amount 4,525,383 5,710,978
Fair value 145,696 277,692
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 5,342,067 6,593,815
Fair value 188,902 279,053
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 3,296,027 3,118,979
Fair value 72,818 96,757
Credit Suisse    
Derivative [Line Items]    
Notional amount 4,581,898 4,422,798
Fair value 102,878 78,823
J.P. Morgan    
Derivative [Line Items]    
Notional amount 3,833,032 3,600,636
Fair value 47,527 54,762
Morgan Stanley    
Derivative [Line Items]    
Notional amount 1,744,800 2,856,466
Fair value 33,258 62,969
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 2,640,076 1,289,699
Fair value 58,383 32,753
Societe Generale    
Derivative [Line Items]    
Notional amount 2,638,886 1,494,904
Fair value 60,749 34,394
Truist    
Derivative [Line Items]    
Notional amount 2,040,196 2,375,124
Fair value 58,879 96,573
Wells Fargo    
Derivative [Line Items]    
Notional amount 5,713,233 4,848,541
Fair value 152,124 196,801
Exchange Traded    
Derivative [Line Items]    
Notional amount 283,983 214,819
Fair value $ 6,285 $ 4,999