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Derivative Instruments (Derivative Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Derivative [Line Items]    
Derivative instruments $ 196,656 $ 1,277,480
Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 39,796,436 40,091,353
Derivative instruments 195,489 1,276,574
Bank of America | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,974,765 3,556,256
Derivative instruments 9,672 99,229
Barclays | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,929,194 4,213,658
Derivative instruments 19,776 157,865
Canadian Imperial Bank of Commerce | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,397,705 3,956,329
Derivative instruments 20,004 141,540
Citibank, N.A. | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,311,681 3,190,833
Derivative instruments 14,324 115,860
Credit Suisse | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,052,678 3,716,868
Derivative instruments 9,822 113,295
J.P. Morgan | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 6,143,105 4,482,832
Derivative instruments 22,155 105,899
Morgan Stanley | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,339,897 2,223,743
Derivative instruments 33,714 47,950
Royal Bank of Canada | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,077,826 3,567,972
Derivative instruments 19,787 100,472
Societe Generale | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,000,609 2,548,072
Derivative instruments 7,917 86,494
Truist | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,910,413 2,547,808
Derivative instruments 9,248 94,924
Wells Fargo | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 5,425,371 5,820,381
Derivative instruments 28,331 206,403
Exchange Traded | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 233,192 266,601
Derivative instruments $ 739 $ 6,643