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Employee Benefit Plans (Marketable Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Retirement Benefits [Abstract] |  |
Marketable securities held in trusts | $ 745 | $ 774

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- Definition Amount of investment in marketable security, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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