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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Notional amount $ 40,091,353 $ 39,362,179
Fair value 1,276,574 1,310,954
Bank of America    
Derivative [Line Items]    
Notional amount 3,556,256 2,835,420
Fair value 99,229 95,378
Barclays    
Derivative [Line Items]    
Notional amount 4,213,658 5,710,978
Fair value 157,865 277,692
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 3,956,329 6,593,815
Fair value 141,540 279,053
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 3,190,833 3,118,979
Fair value 115,860 96,757
Credit Suisse    
Derivative [Line Items]    
Notional amount 3,716,868 4,422,798
Fair value 113,295 78,823
J.P. Morgan    
Derivative [Line Items]    
Notional amount 4,482,832 3,600,636
Fair value 105,899 54,762
Morgan Stanley    
Derivative [Line Items]    
Notional amount 2,223,743 2,856,466
Fair value 47,950 62,969
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 3,567,972 1,289,699
Fair value 100,472 32,753
Societe Generale    
Derivative [Line Items]    
Notional amount 2,548,072 1,494,904
Fair value 86,494 34,394
Truist    
Derivative [Line Items]    
Notional amount 2,547,808 2,375,124
Fair value 94,924 96,573
Wells Fargo    
Derivative [Line Items]    
Notional amount 5,820,381 4,848,541
Fair value 206,403 196,801
Exchange Traded    
Derivative [Line Items]    
Notional amount 266,601 214,819
Fair value $ 6,643 $ 4,999