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Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) Item shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Minimum percent of prepaid reinsurance premiums for any foreign reinsurers that were collateralized | 10.00% |  |  |
Number of operating segments | Item | 2 |  |  |
Options outstanding | shares |  | 49,028 | 116,871 | 170,704
Anti-dilutive options | shares |  | 0 | 0 |
Change in beginning balance due to adoption of ASU | $ 8,441 | $ 10,139 | $ 9,726 |
Accumulated Other Comprehensive Income [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Change in beginning balance due to adoption of ASU | (1,996) | 12 | 535 | $ 28
Retained Earnings [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Change in beginning balance due to adoption of ASU | $ 12,042 | 11,700 | 10,567 | 10,307
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Cumulative Effect Period Of Adoption Adjustment [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Change in beginning balance due to adoption of ASU |  |  |  | $ (4)

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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