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Fair Value Measures - Changes in Fair Value Included in Earnings - Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2023
Fair Value Disclosures [Abstract] |  |
Change in fair value included in earnings | $ 8 | $ 43

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-30 + Details
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