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Insurance Liabilities - Balances and Changes in Liability for Future Policy Benefits (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Balance, beginning of year | $ 1,702 | $ 1,929 |  |
Effect of changes in discount rate assumptions (AOCI) | 339 | 262 |  |
Beginning balance at original discount rate | 2,041 | 2,191 |  |
Effect of changes in experience |  |  | $ (7) | $ (26)
Adjusted beginning of year balance | 2,034 | 2,165 |  |
Issuances | 54 | 67 |  |
Interest accrual | 21 | 21 |  |
Net premium collected | (208) | (117) |  |
Foreign exchange impact | (155) | (88) |  |
Ending balance at original discount rate | 1,746 | 2,048 |  |
Effect of changes in discount rate assumptions (AOCI) | (246) | (330) |  |
Balance, end of period | 1,500 | 1,718 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 2,149 | 2,380 |  |
Effect of changes in discount rate assumptions (AOCI) | 441 | 362 |  |
Beginning balance at original discount rate | 2,590 | 2,742 |  |
Effect of actual variances from expected experience |  |  | (8) | $ (16)
Adjusted beginning of year balance | 2,582 | 2,726 |  |
Issuances | 56 | 70 |  |
Interest accrual | 26 | 26 |  |
Benefit payments | (212) | (122) |  |
Foreign exchange impact | (203) | (121) |  |
Ending balance at original discount rate | 2,249 | 2,579 |  |
Effect of changes in discount rate assumptions (AOCI) | (329) | (423) |  |
Ending balance | 1,920 | 2,156 |  |
Net liability for future policy benefits, end of period | 420 | 438 |  |
Deferred profit liability | 1 | 1 |  |
Other reconciling items | 934 | 963 |  |
Future policy benefits for life and accident and health insurance contracts | 1,355 | 1,402 | 1,467 |
Less: Reinsurance recoverable | (761) | (754) |  |
Liability for future policy benefits, end of period, net of Reinsurance recoverable | $ 594 | $ 648 |  |
Weighted average liability duration of the liability for future policy benefits (in years) | 9 years | 9 years 10 months 24 days |  |
Long-Duration Insurance |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Other reconciling items | $ 724 |  | $ 713 |
Ceded percentage | 1 |  | 1 |

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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected net premium component for liability for future policy benefit, discounted at original rate. + References Reference 1: 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 2: 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 3: 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 + Details
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