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Policyholder Account Balances, Future Policy Benefits and Claims - Composition (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Policyholder account balances |  |  |
Policyholder account balances | $ 31,580 | $ 27,947 | $ 24,986
Future policy benefits |  |  |
Reserve for future policy benefits | 7,855 | 7,763 |
Deferred profit liability | 114 | 81 |
Additional liabilities for insurance guarantees | 1,405 | 1,321 |
Other insurance and annuity liabilities | 162 | 213 |
Total future policy benefits | 9,536 | 9,378 |
Policy claims and other policyholders’ funds | 216 | 220 |
Total policyholder account balances, future policy benefits and claims | $ 41,332 | $ 37,545 |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 4: 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 + Details
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