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Fair Value Measurements (Narrative) (Details) € in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 EUR (€) | Dec. 31, 2020
Fair Value Measurements [Line Items] |  |  |  |
Debt Instrument, Face Amount | € |  |  | € 500 |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ (383) | $ (210) |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 847 | $ 381 |  |
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member] |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |
Basis |  |  | 12.20% | 13.70%
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventories Carried At Market [Member] |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |
Basis |  |  | 29.20% | 4.30%

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