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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Derivative [Line Items]    
Notional amount $ 40,221,513 $ 40,091,353
Fair value 640,578 1,276,574
Bank of America    
Derivative [Line Items]    
Notional amount 3,392,015 3,556,256
Fair value 25,419 99,229
Barclays    
Derivative [Line Items]    
Notional amount 4,021,050 4,213,658
Fair value 96,179 157,865
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 3,496,022 3,956,329
Fair value 78,800 141,540
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 2,573,024 3,190,833
Fair value 16,407 115,860
Credit Suisse    
Derivative [Line Items]    
Notional amount 3,655,865 3,716,868
Fair value 40,370 113,295
J.P. Morgan    
Derivative [Line Items]    
Notional amount 5,181,335 4,482,832
Fair value 47,659 105,899
Morgan Stanley    
Derivative [Line Items]    
Notional amount 2,911,156 2,223,743
Fair value 11,199 47,950
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 4,247,259 3,567,972
Fair value 85,839 100,472
Societe Generale    
Derivative [Line Items]    
Notional amount 2,373,286 2,548,072
Fair value 39,953 86,494
Truist    
Derivative [Line Items]    
Notional amount 2,170,979 2,547,808
Fair value 52,640 94,924
Wells Fargo    
Derivative [Line Items]    
Notional amount 5,917,801 5,820,381
Fair value 141,532 206,403
Exchange Traded    
Derivative [Line Items]    
Notional amount 281,721 266,601
Fair value $ 4,581 $ 6,643