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Policyholder Account Balances, Future Policy Benefits and Claims - Additional Liabilities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Additional Liability, Long-Duration Insurance [Roll Forward] |  |
Beginning balance | $ 1,321 | $ 1,186
Interest accrual | 22 | 41
Benefit accrual | 72 | 138
Benefit payments | (37) | (72)
Effect of actual variances from expected experience | (6) | (4)
Impact of change in net unrealized (gains) losses on securities | (21) | 32
Ending balance | 1,351 | 1,321
Universal Life Insurance |  |
Additional Liability, Long-Duration Insurance [Roll Forward] |  |
Beginning balance | 1,225 | 1,100
Interest accrual | 19 | 35
Benefit accrual | 66 | 128
Benefit payments | (27) | (50)
Effect of actual variances from expected experience | (7) | (13)
Impact of change in net unrealized (gains) losses on securities | (16) | 25
Ending balance | $ 1,260 | $ 1,225
Weighted average interest accretion rate | 3.00% | 3.00%
Weighted average discount rate | 3.20% | 3.20%
Weighted average duration of reserves (in years) | 10 years | 10 years
Variable Universal Life Insurance |  |
Additional Liability, Long-Duration Insurance [Roll Forward] |  |
Beginning balance | $ 81 | $ 74
Interest accrual | 3 | 5
Benefit accrual | 4 | 8
Benefit payments | (8) | (18)
Effect of actual variances from expected experience | 1 | 11
Impact of change in net unrealized (gains) losses on securities | (1) | 1
Ending balance | $ 80 | $ 81
Weighted average interest accretion rate | 7.10% | 6.90%
Weighted average discount rate | 7.10% | 7.10%
Weighted average duration of reserves (in years) | 8 years | 8 years
Other Life Insurance |  |
Additional Liability, Long-Duration Insurance [Roll Forward] |  |
Beginning balance | $ 15 | $ 12
Interest accrual | 0 | 1
Benefit accrual | 2 | 2
Benefit payments | (2) | (4)
Effect of actual variances from expected experience | 0 | (2)
Impact of change in net unrealized (gains) losses on securities | (4) | 6
Ending balance | $ 11 | $ 15
Weighted average interest accretion rate | 4.00% | 4.00%
Weighted average discount rate | 4.00% | 4.00%
Weighted average duration of reserves (in years) | 6 years | 6 years

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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + 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 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of cash outflow to policyholder related to benefit payment for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + 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 (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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- Definition Current weighted-average discount rate used to measure present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of increase (decrease) in present value of total expected payment to policyholder in excess of present value of total expected assessment from cash flow assumption change for future cash flows from change in discount rate. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + 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 + Details
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- Definition Amount of increase in present value of total expected payment to policyholder in excess of present value of total expected assessment from contract issuance. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + 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 (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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