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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Cash Equivalents [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 1,685 | $ 2,296 | $ 1,488
Marketable Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 53 | 124 | $ 254
Other Assets [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities |  | $ 27 |

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