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Financial Instruments - Interest Rate Risk (Details)
€ in Millions, kr in Millions, SFr in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
DKK (kr)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
CHF (SFr)
Dec. 31, 2019
DKK (kr)
swap
Dec. 31, 2019
EUR (€)
swap
Dec. 31, 2019
USD ($)
swap
Dec. 31, 2019
CHF (SFr)
swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]                    
Unrecognized net gains/(losses) on cross-currency interest rate swap contracts, recorded, net of tax $ 17 $ 8                
Cross-currency interest rate swap contracts                    
Derivative Instruments and Hedging Activities Disclosures [Line Items]                    
Derivative notional amount     kr 600 € 650 $ 150 SFr 25 kr 600 € 650 $ 150 SFr 25
Derivatives Not Designated as Hedging Instruments | Foreign currency forward-exchange contracts                    
Derivative Instruments and Hedging Activities Disclosures [Line Items]                    
Derivative notional amount         $ 1,272       $ 1,364  
Foreign currency forward-exchange contracts 6 (4)                
Derivatives Designated as Hedging Instruments: | Cross-currency interest rate swap contracts                    
Derivative Instruments and Hedging Activities Disclosures [Line Items]                    
Unrecognized net gains/(losses) on cross-currency interest rate swap contracts, recorded, net of tax $ 17 $ 18                
Derivatives Designated as Hedging Instruments: | Interest rate swaps                    
Derivative Instruments and Hedging Activities Disclosures [Line Items]                    
Derivative, Number of Instruments Held         450   0 0 0 0