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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Cash Equivalents [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 1,746 | $ 2,296
Marketable Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 98 | 124
Other Assets [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 55 | $ 27

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