Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 170	$ 163
Fair Value of Liabilities	0	87
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	0	87
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	0	0
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	0	0
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	0	87
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	0	0
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	170	163
Cronos Warrant [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	150	139
Fixed-price Preemptive Rights [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 20	$ 24