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Future Policy Benefits - Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Present Value of Expected Net Premiums: |  |  |
Balance, beginning of period | $ 3,145 | $ 3,520 |
Beginning balance at original discount rate | 3,254 | 3,826 |
Effect of changes in cash flow assumptions |  | (63) | $ (353)
Effect of actual variances from expected experience |  | (28) | (57)
Adjusted beginning of period balance |  | 3,163 | 3,416
Acquisition from business combination | 0 | 0 |
Issuances | 1,023 | 1,074 |
Interest accrual | 68 | 129 |
Net premiums collected | (1,166) | (1,368) |
Derecognitions (lapses and withdrawals) | 1 | 3 |
Foreign currency translation | 0 | 0 |
Ending balance at original discount rate | 3,089 | 3,254 |
Effect of changes in discount rate assumptions | (235) | (109) |
Balance, end of period | 2,854 | 3,145 |
Present Value of Expected Future Policy Benefits: |  |  |
Balance, beginning of period | 7,253 | 6,618 |
Beginning balance at original discount rate | 7,494 | 7,243 |
Effect of changes in cash flow assumptions |  | 75 | (363)
Effect of actual variances from expected experience |  | (27) | (84)
Adjusted beginning of period balance |  | 7,542 | 6,796
Acquisition of business combination | 311 | 0 |
Issuances | 1,035 | 1,077 |
Interest accrual | 172 | 261 |
Benefit payments | (363) | (645) |
Derecognitions (lapses and withdrawals) | 2 | 5 |
Foreign currency translation | 0 | 0 |
Ending balance at original discount rate | 8,699 | 7,494 |
Effect of changes in discount rate assumptions | (596) | (241) |
Effect of foreign currency translation on the effect of changes in discount rate assumptions | 0 | 0 |
Balance, end of period | 8,103 | 7,253 |
Total future policy benefits | 5,249 | 4,108 |
Less: Reinsurance recoverables | (49) | (45) |
Net liability for future policy benefits, after reinsurance recoverable | 5,200 | 4,063 |
Annuity |  |  |
Present Value of Expected Net Premiums: |  |  |
Balance, beginning of period | 0 | 0 |
Beginning balance at original discount rate | 0 | 0 |
Effect of changes in cash flow assumptions |  | 0 | 0
Effect of actual variances from expected experience |  | 6 | 2
Adjusted beginning of period balance |  | 6 | 2
Acquisition from business combination | 0 | 0 |
Issuances | 991 | 984 |
Interest accrual | 6 | 8 |
Net premiums collected | (1,004) | (995) |
Derecognitions (lapses and withdrawals) | 0 | 1 |
Foreign currency translation | 0 | 0 |
Ending balance at original discount rate | (1) | 0 |
Effect of changes in discount rate assumptions | 0 | 0 |
Balance, end of period | (1) | 0 |
Present Value of Expected Future Policy Benefits: |  |  |
Balance, beginning of period | 2,213 | 1,288 |
Beginning balance at original discount rate | 2,217 | 1,368 |
Effect of changes in cash flow assumptions |  | 1 | (1)
Effect of actual variances from expected experience |  | 6 | (25)
Adjusted beginning of period balance |  | 2,224 | 1,342
Acquisition of business combination | 311 | 0 |
Issuances | 1,003 | 988 |
Interest accrual | 71 | 73 |
Benefit payments | (135) | (189) |
Derecognitions (lapses and withdrawals) | 1 | 3 |
Foreign currency translation | 0 | 0 |
Ending balance at original discount rate | 3,475 | 2,217 |
Effect of changes in discount rate assumptions | (91) | (4) |
Effect of foreign currency translation on the effect of changes in discount rate assumptions | 0 | 0 |
Balance, end of period | 3,384 | 2,213 |
Total future policy benefits | 3,385 | 2,213 |
Less: Reinsurance recoverables | (3) | 0 |
Net liability for future policy benefits, after reinsurance recoverable | $ 3,382 | $ 2,213 |
Weighted-average liability duration of future policy benefits (years) | 8 years | 8 years |
Weighted average interest accretion rate | 5.09% | 4.94% |
Weighted average current discount rate | 5.47% | 4.88% |
Life |  |  |
Present Value of Expected Net Premiums: |  |  |
Balance, beginning of period | $ 3,145 | $ 3,520 |
Beginning balance at original discount rate | 3,254 | 3,826 |
Effect of changes in cash flow assumptions |  | (63) | (353)
Effect of actual variances from expected experience |  | (34) | (59)
Adjusted beginning of period balance |  | 3,157 | 3,414
Acquisition from business combination | 0 | 0 |
Issuances | 32 | 90 |
Interest accrual | 62 | 121 |
Net premiums collected | (162) | (373) |
Derecognitions (lapses and withdrawals) | 1 | 2 |
Foreign currency translation | 0 | 0 |
Ending balance at original discount rate | 3,090 | 3,254 |
Effect of changes in discount rate assumptions | (235) | (109) |
Balance, end of period | 2,855 | 3,145 |
Present Value of Expected Future Policy Benefits: |  |  |
Balance, beginning of period | 5,040 | 5,330 |
Beginning balance at original discount rate | 5,277 | 5,875 |
Effect of changes in cash flow assumptions |  | 74 | (362)
Effect of actual variances from expected experience |  | (33) | (59)
Adjusted beginning of period balance |  | 5,318 | $ 5,454
Acquisition of business combination | 0 | 0 |
Issuances | 32 | 89 |
Interest accrual | 101 | 188 |
Benefit payments | (228) | (456) |
Derecognitions (lapses and withdrawals) | 1 | 2 |
Foreign currency translation | 0 | 0 |
Ending balance at original discount rate | 5,224 | 5,277 |
Effect of changes in discount rate assumptions | (505) | (237) |
Effect of foreign currency translation on the effect of changes in discount rate assumptions | 0 | 0 |
Balance, end of period | 4,719 | 5,040 |
Total future policy benefits | 1,864 | 1,895 |
Less: Reinsurance recoverables | (46) | (45) |
Net liability for future policy benefits, after reinsurance recoverable | $ 1,818 | $ 1,850 |
Weighted-average liability duration of future policy benefits (years) | 16 years | 16 years |
Weighted average interest accretion rate | 4.61% | 4.60% |
Weighted average current discount rate | 5.58% | 5.03% |

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- 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 of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows. + 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 (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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