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Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Trust funds | $ 13,553 | $ 12,305
Deposits with U.S. regulatory authorities | 2,424 | 2,438
Deposits With Non United States Regulatory Authorities | 2,917 | 2,905
Assets pledged under repurchase agreements | 1,458 | 1,462
Other pledged assets | 638 | 584
Total restricted assets | $ 20,990 | $ 19,694

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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