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Investments (Narrative) (Details) $ in Billions | Dec. 31, 2022 USD ($) positions | Dec. 31, 2021 USD ($)
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Investments [Abstract] |  |
Equity Securities, FV-NI and without Readily Determinable Fair Value | $ 3.7 | $ 3.5
Equity Method Investments | $ 1.5 | $ 1.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions | 35,000 |
Total number of security positions | 41,000 |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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