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Derivative Instruments (Schedule of Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative instruments	$ 431,727	$ 1,277,480
Derivative collateral	400,000	1,300,000
Credit risk, maximum exposure	3,300	8,500
Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	39,335,903	40,091,353
Derivative instruments	430,558	1,276,574
Bank of America | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	3,574,125	3,556,256
Derivative instruments	26,080	99,229
Barclays | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	3,686,896	4,213,658
Derivative instruments	39,657	157,865
Canadian Imperial Bank of Commerce | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	2,707,734	3,956,329
Derivative instruments	34,218	141,540
Citibank, N.A. | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	3,748,162	3,190,833
Derivative instruments	29,873	115,860
Credit Suisse | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	2,086,470	3,716,868
Derivative instruments	20,691	113,295
J.P. Morgan | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	6,501,103	4,482,832
Derivative instruments	69,006	105,899
Morgan Stanley | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	2,957,389	2,223,743
Derivative instruments	38,470	47,950
Royal Bank of Canada | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	4,378,132	3,567,972
Derivative instruments	58,026	100,472
Societe Generale | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	2,099,081	2,548,072
Derivative instruments	17,157	86,494
Truist | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	1,960,787	2,547,808
Derivative instruments	32,885	94,924
Wells Fargo | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	5,436,824	5,820,381
Derivative instruments	61,840	206,403
Exchange Traded | Call Options And Interest Rate Swaps
Derivative [Line Items]
Notional amount	199,200	266,601
Derivative instruments	$ 2,655	$ 6,643

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- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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