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Derivative Instruments (Change in Fair Value of Derivatives Not Designated as Hedging) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | $ (2,352,598) | $ (358,302) | $ (1,286,787)
Call Options |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, term of contract | 1 year |  |
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | $ (1,104,547) | 1,348,735 | 34,666
Change in fair value of embedded derivatives | (2,352,598) | (358,302) | (1,286,787)
Not Designated as Hedging Instrument | Call Options |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | (1,118,768) | 1,347,925 | 34,604
Not Designated as Hedging Instrument | Warrants |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 264 | 810 | 0
Not Designated as Hedging Instrument | Interest Rate Swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 13,957 | 0 | 0
Not Designated as Hedging Instrument | Interest Rate Caps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 0 | 0 | 62
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | (2,561,676) | (876,803) | (1,922,085)
Not Designated as Hedging Instrument | Other Changes in Difference Between Policy Benefit Reserves Computed Using Derivative Accounting Vs. Long-Duration Contracts Accounting |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | 648,580 | 520,863 | 635,298
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | $ (439,502) | $ (2,362) | $ 0

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -URI https://asc.fasb.org/subtopic&trid=2229187 + Details
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