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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

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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