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Reinsurance (Funds Withheld) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Reinsurance Liabilities Table [Line Items] |  |
Funds Held under Reinsurance Agreements, Liability | $ 4,483 | $ 1,486
Funds withheld at interest | 5,683 | 6,003
Available-for-sale Securities [Member] |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 2,442 | 203
Equity Securities [Member] |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 2 | 1
Mortgage Loans on Real Estate [Member] |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 451 | 18
Funds Withheld At Interest [Member] |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 1,545 | 1,596
Partnership Interest [Member] |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 35 | 0
Short-term Investments [Member] |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 30 | 1
Accrued Income Receivable |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 28 | 3
Other Assets |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | 1 | 0
Assets |  |
Reinsurance Liabilities Table [Line Items] |  |
Funds withheld at interest | $ 4,534 | $ 1,822

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- Definition Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References Reference 1: 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)(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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