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Investments (Schedule Of Components Of Restricted Assets) (Detail) - Asset Pledged as Collateral without Right - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Investments [Line Items]
Trust funds	$ 8,675	$ 8,170
Assets pledged under repurchase agreements	3,580	2,890
Deposits with U.S. regulatory authorities	2,563	2,487
Deposits with non-U.S. regulatory authorities and other	4,489	4,659
Total restricted assets	$ 19,307	$ 18,206

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- Definition

[Line Items] for This table lists the investments. The line items identify information about all investments.

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Restricted assets that are deposits with non-US regulatory authorities and Other Pledged Assets

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Restricted assets that are deposits with US regulatory authorities.

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
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Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Section 55
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