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Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Alternative Investments, Upward Price Adjustment, Annual Amount | $ 6 | $ 17 | $ 6 | $ 103
Alternative Investment, Downward Price Adjustment Including Impairment, Annual Amount | (2) | (12) | (135) | (12)
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 121 | $ (126) | $ 55 | $ (288)

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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 -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-4 + Details
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