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Derivative Instruments (Derivative Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Derivative [Line Items]    
Derivative instruments $ 200,781 $ 1,277,480
Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 44,273,654 40,091,353
Derivative instruments 199,697 1,276,574
Bank of America | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,477,313 3,556,256
Derivative instruments 10,397 99,229
Barclays | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 5,940,861 4,213,658
Derivative instruments 39,825 157,865
Canadian Imperial Bank of Commerce | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,654,097 3,956,329
Derivative instruments 17,740 141,540
Citibank, N.A. | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,754,192 3,190,833
Derivative instruments 11,840 115,860
Credit Suisse | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,681,742 3,716,868
Derivative instruments 12,505 113,295
J.P. Morgan | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 5,848,823 4,482,832
Derivative instruments 24,829 105,899
Morgan Stanley | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,726,821 2,223,743
Derivative instruments 4,090 47,950
Royal Bank of Canada | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 6,358,846 3,567,972
Derivative instruments 30,190 100,472
Societe Generale | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,970,537 2,548,072
Derivative instruments 11,627 86,494
Truist | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,919,830 2,547,808
Derivative instruments 6,519 94,924
Wells Fargo | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 5,685,401 5,820,381
Derivative instruments 29,114 206,403
Exchange Traded | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 255,191 266,601
Derivative instruments $ 1,021 $ 6,643