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Derivative Instruments (Change in Fair Value of Derivatives Not Designated as Hedging) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | $ 404,440 | $ (1,393,649) | [1]
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 44,765 | (477,519) |
Change in fair value of embedded derivatives | 404,440 | (1,393,649) |
Not Designated as Hedging Instrument | Call Options |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 43,444 | (478,448) |
Not Designated as Hedging Instrument | Warrants |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 1,321 | 929 |
Not Designated as Hedging Instrument | Fixed index annuities - embedded derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | 205,469 | (1,308,123) |
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 | 134,591 | 116,918 |
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | $ 64,380 | $ (202,444) |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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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 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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