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Financial Instruments Derivative Notional Amounts (Details)
€ in Millions, kr in Millions, SFr in Millions, $ in Millions
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
Cross-currency interest rate swap contracts                
Derivative [Line Items]                
Derivative notional amount kr 600 € 650 $ 150 SFr 25 kr 600 € 650 $ 150 SFr 25
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contract                
Derivative [Line Items]                
Derivative notional amount     $ 1,272       $ 1,364  
Derivatives Designated as Hedging Instruments: | Interest rate swaps                
Derivative [Line Items]                
Derivative, Number of Instruments Held     450   0 0 0 0