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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
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Cash Equivalents [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 1,414 | $ 3,400 | $ 1,602
Marketable Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | 290 | $ 86 | 49
cash and cash equivalents, marketable securities, and other current assets |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available - for- sale securities |  |  | $ 65
Other Assets [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 53 |  |

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