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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses, beginning of period | $ 37,352 | $ 22,238
Cumulative effect adjustment resulting from changes in accounting principles | 37,142 | 26,153
Expected credit losses on securities for which credit losses were not previously recorded | 186 | 484
Expected credit losses (gains) on securities for which credit losses were previously recorded | (391) | 3,431
Reduction due to disposals | (5) | 0
Allowance for expected credit losses, end of period | 37,142 | 26,153
Foreign government |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses, beginning of period | 32,633 | 22,222
Cumulative effect adjustment resulting from changes in accounting principles | 33,324 | 26,153
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 484
Expected credit losses (gains) on securities for which credit losses were previously recorded | 691 | 3,447
Reduction due to disposals | 0 | 0
Allowance for expected credit losses, end of period | 33,324 | 26,153
Corporate |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses, beginning of period | 4,701 | 16
Cumulative effect adjustment resulting from changes in accounting principles | 3,795 | 0
Expected credit losses on securities for which credit losses were not previously recorded | 186 | 0
Expected credit losses (gains) on securities for which credit losses were previously recorded | (1,087) | (16)
Reduction due to disposals | (5) | 0
Allowance for expected credit losses, end of period | 3,795 | $ 0
Mortgage-backed |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance for expected credit losses, beginning of period | 18 |
Cumulative effect adjustment resulting from changes in accounting principles | 23 |
Expected credit losses on securities for which credit losses were not previously recorded | 0 |
Expected credit losses (gains) on securities for which credit losses were previously recorded | 5 |
Reduction due to disposals | 0 |
Allowance for expected credit losses, end of period | $ 23 |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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