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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%