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Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |
Alternative Investments, Upward Price Adjustment, Annual Amount | $ 0 | $ 86
Alternative Investment, Downward Price Adjustment Including Impairment, Annual Amount | (133) | 0
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (66) | $ (162)

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- Definition Alternative Investment, Downward Price Adjustment Including Impairment, Annual Amount + References No definition available. + Details
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- Definition Alternative Investments, Upward Price Adjustment, Annual Amount + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714 + Details
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