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Investments (Assets on Deposit, Held in Trust and Restricted as to Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Assets on Deposit, Held in Trust and Restricted as to Sale [Line Items] |  |
Assets on deposit with governmental authorities or trustees | $ 8 | $ 10
Assets held in voluntary trusts | 510 | 476
Assets held in trust related to reinsurance and other agreements | 13,214 | 12,815
Securities restricted as to sale | 144 | 149
Total assets on deposit, assets held in trust and securities restricted as to sale | 13,876 | 13,450
Wholly-owned subsidiaries |  |
Assets on Deposit, Held in Trust and Restricted as to Sale [Line Items] |  |
Assets held in trust related to reinsurance and other agreements | $ 25,700 | $ 26,000

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-1A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480632/954-210-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480602/954-210-50-2 + Details
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