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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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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.

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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.

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Number of options outstanding, including both vested and non-vested options.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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