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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Cash Equivalents [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 1,602 | $ 2,511 | $ 1,536
Available - for- sale securities | 65 | 226 |
Marketable Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities | $ 49 | $ 43 | $ 10

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