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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Liability for Lifetime Income Benefit Riders) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Balance at beginning of year | $ 65,477,778 |  |
Balance at end of year | 61,118,134 | $ 65,477,778 |
Liability for Lifetime Income Benefit Riders |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Balance at beginning of year | 2,794,629 | 2,485,123 | $ 1,670,750
Benefit expense accrual | 387,821 | 206,180 | 311,211
Impact of unlocking | (53,042) | 243,658 | 285,825
Effect of net unrealized gains/losses | (996,876) | (101,848) | 217,337
Reduction related to in-force ceded reinsurance | (403,406) | (38,484) | 0
Claim payments | 0 | 0 | 0
Balance at end of year | $ 1,729,126 | $ 2,794,629 | $ 2,485,123

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- Definition Amount of unrealized investment gain (loss) which decreases (increases) the liability for future policy benefit. + References No definition available. + Details
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- Definition Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)(1)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 + Details
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