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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Cash Equivalents [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 3,400 | $ 2,511
Available-for-sale securities |  | 226
Marketable Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 86 | $ 43

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