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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Cash Equivalents [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 2,296 | $ 3,400
Marketable Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 124 | $ 86
Other Assets [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 27 |

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