Financial Instruments (Derivative Notional Amounts) (Details) € in Millions, kr in Millions, SFr in Millions, $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 DKK (kr)	Dec. 31, 2020 CHF (SFr)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 DKK (kr)	Dec. 31, 2019 CHF (SFr)
Foreign Exchange Forward | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Derivative, notional amount	$ 1,633				$ 1,364
Cross-currency interest rate swap contracts
Derivative [Line Items]
Derivative, notional amount	150	€ 650	kr 600	SFr 25	150	€ 650	kr 600	SFr 25
Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	550				$ 250
Interest Rate Swap | Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Derivative, notional amount	$ 350