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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
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Cash Equivalents [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 921 | $ 3,400 | $ 2,108
Marketable Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | 119 | $ 86 | $ 103
Other Assets [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 24 |  |

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