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Future Policy Benefits - Summary Balances and Changes in the Present Value of Expected Net Premiums and Present Value (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |
Net liability for future policy benefits | $ 7,636 | $ 7,050 |
Traditional Life |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |
Balance, beginning of year | 722 | 797 |
Beginning balance of original discount rate | 874 | 974 |
Effect of actual variances from expected experience |  | (2) | $ (1)
Balance adjusted for variances from expectation |  | 872 | 973
Interest accrual | 9 | 19 |
Net premiums collected | (55) | (118) |
Ending Balance at original discount rate | 826 | 874 |
Effect of changes in discount rate assumptions | (160) | (152) |
Balance, end of year | 666 | 722 |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |
Balance, beginning of year | 2,071 | 2,151 |
Beginning balance of original discount rate | 2,492 | 2,665 |
Effect of actual variances from expected experience |  | 58 | (24)
Balance adjusted for variances from expectation |  | 2,550 | 2,641
Interest accrual | 27 | 56 |
Benefits payments | (108) | (205) |
Ending Balance at original discount rate | 2,469 | 2,492 |
Effect of changes in discount rate assumptions | (460) | (421) |
Balance, end of year | 2,009 | 2,071 |
Net liability for future policy benefits | 1,343 | 1,349 |
Less: Reinsurance recoverable | 524 | 413 |
Liability for Future Policy Benefit, after Reinsurance, Total | $ 819 | $ 936 |
Weighted-average duration of liability for future policyholder benefits (years) | 6 years 10 months 17 days | 7 years 4 months 9 days |
Immediate Annuities |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |
Balance, beginning of year | $ 1,415 | $ 1,429 |
Beginning balance of original discount rate | 1,788 | 1,858 |
Effect of changes in cash flow assumptions |  | 0 | 0
Effect of actual variances from expected experience |  | (21) | (15)
Balance adjusted for variances from expectation |  | 1,767 | 1,843
Issuances | 18 | 22 |
Interest accrual | 30 | 51 |
Benefits payments | (59) | (128) |
Ending Balance at original discount rate | 1,756 | 1,788 |
Effect of changes in discount rate assumptions | (431) | (373) |
Balance, end of year | 1,325 | 1,415 |
Net liability for future policy benefits | 1,325 | 1,415 |
Less: Reinsurance recoverable | 111 | 116 |
Liability for Future Policy Benefit, after Reinsurance, Total | $ 1,214 | $ 1,299 |
Weighted-average duration of liability for future policyholder benefits (years) | 11 years 9 months 14 days | 12 years 5 months 19 days |
PRT |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |
Balance, beginning of year | $ 4,189 | $ 2,165 |
Beginning balance of original discount rate | 4,351 | 2,475 |
Effect of changes in cash flow assumptions |  | 5 | (9)
Effect of actual variances from expected experience |  | (15) | (7)
Balance adjusted for variances from expectation |  | 4,341 | $ 2,459
Issuances | 952 | 2,041 |
Interest accrual | 109 | 109 |
Benefits payments | (223) | (258) |
Ending Balance at original discount rate | 5,179 | 4,351 |
Effect of changes in discount rate assumptions | (310) | (162) |
Balance, end of year | 4,869 | 4,189 |
Net liability for future policy benefits | 4,869 | 4,189 |
Less: Reinsurance recoverable | 0 | 0 |
Liability for Future Policy Benefit, after Reinsurance, Total | $ 4,869 | $ 4,189 |
Weighted-average duration of liability for future policyholder benefits (years) | 7 years 9 months 7 days | 8 years 2 months 23 days |

X
- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from increase (decrease) in expected net premium component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 + Details
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- Definition Amount of interest expense for expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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- Definition Amount, after allowance for credit loss, recoverable under reinsurance of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E + Details
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- Definition Weighted-average duration of liability for future policy benefit, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + 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 -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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