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Financial Instruments and Fair Value Measurements, Summary of fair value hedges (Details)
€ in Millions, $ in Millions
1 Months Ended 6 Months Ended
Apr. 30, 2020
USD ($)
Jan. 31, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Guaranteed Notes due 2026, €500 million, 0.875%          
Derivative [Line Items]          
Face amount       € 500  
Maturity year     2026    
Fair value hedge [Member] | Interest rate contract [Member]          
Derivative [Line Items]          
Notional value | $ $ 2,000   $ 252   $ 2,140
Proceeds from termination of fair value hedges | $ $ 147        
Fair value hedge [Member] | Interest rate contract [Member] | Guaranteed Notes due 2026, €500 million, 0.875%          
Derivative [Line Items]          
Amount of hedged item   € 100      
Face amount   € 500      
Maturity year   2026      
Fair value hedge [Member] | Interest rate contract [Member] | Minimum [Member]          
Derivative [Line Items]          
Derivative, maturity date 2021   2022    
Fair value hedge [Member] | Interest rate contract [Member] | Maximum [Member]          
Derivative [Line Items]          
Derivative, maturity date 2027   2026