Deferred Policy Acquisition Costs (Movement Analysis Of Deferred Policy Acquisition Costs) (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost	$ 4,128
Deferred Policy Acquisition Cost	$ 4,617

Amount of deferred policy acquisition cost capitalized on contract remaining in force.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant