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Financial Instruments and Fair Value Measurements, Summary of fair value hedges (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2020
USD ($)
Jan. 31, 2020
EUR (€)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Guaranteed Notes due 2026, €500 million, 0.875% ($2 million of discount; $3 million of debt issuance cost)          
Derivative [Line Items]          
Face amount | €     € 500    
Maturity year     2026    
Fair value hedge [Member] | Interest rate contract [Member]          
Derivative [Line Items]          
Notional value | $       $ 2,246 $ 2,140
Fair value hedge [Member] | Interest rate contract [Member] | Guaranteed Notes due 2026, €500 million, 0.875% ($2 million of discount; $3 million of debt issuance cost)          
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    
Fair value hedge [Member] | Interest rate contract [Member] | Maximum [Member]          
Derivative [Line Items]          
Derivative, maturity date     2027    
Fair value hedge [Member] | Interest rate contract [Member] | Subsequent event [Member]          
Derivative [Line Items]          
Notional value | $ $ 2,000        
Proceeds from termination of fair value hedges | $ $ 147        
Fair value hedge [Member] | Interest rate contract [Member] | Subsequent event [Member] | Minimum [Member]          
Derivative [Line Items]          
Derivative, maturity date 2021        
Fair value hedge [Member] | Interest rate contract [Member] | Subsequent event [Member] | Maximum [Member]          
Derivative [Line Items]          
Derivative, maturity date 2027