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Derivative Instruments (Carrying Amount and Cumulative Fair Value Hedging Adjustments) (Details) - Fixed Maturity Securities, Available For Sale - Fair Value Hedging - Designated as Hedging Instrument - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Derivative [Line Items] |  |
Current hedging relationships, amortized cost of hedged item | $ 0 | $ 389,060
Current hedging relationships, cumulative amount of fair value basis adjustment gain (loss) | 0 | (39,128)
Discontinued hedging relationships, amortized cost of hedged item | 1,280,224 | 1,594,736
Discontinued hedging relationships, cumulative amount of fair value basis adjustment gain (loss) | $ (69,756) | $ (94,681)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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