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Reinsurance (Narrative) (Details) - USD ($) $ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Reinsurance Disclosures [Abstract] |  |
Deposit assets in premiums, reinsurance, and other receivables or secondary guarantee risk for reinsurance | $ 1.9 | $ 1.8
Deposit liabilities in other liabilities for reinsurance | 1.4 | 1.4
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverables | 6.1 | 6.3
Ceded Credit Risk, Unsecured [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverables | 3.9 | 3.6
Five Largest Ceded Reinsurers [Member] |  |
Ceded Credit Risk [Line Items] |  |
Five largest reinsurers, reinsurance recoverables amount | $ 4.2 | $ 4.1
Five largest reinsurers, reinsurance recoverables percentage | 69.00% | 65.00%
Five Largest Ceded Reinsurers [Member] | Ceded Credit Risk, Unsecured [Member] |  |
Ceded Credit Risk [Line Items] |  |
Five largest reinsurers, reinsurance recoverables amount | $ 2.4 | $ 1.9
Modified Coinsurance of Closed Block [Member] |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance Retention Policy, Reinsured Risk, Percentage | 59.25% |

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- Definition Percentage of total reinsurance recoverables which constitute a concentration of credit risk. + References No definition available. + Details
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- Definition Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=99397363&loc=d3e9420-108338 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=99383045&loc=d3e9351-108337 + Details
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