Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 104	$ 349
Fair Value of Liabilities	55	28
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	3	46
Fair Value of Liabilities	55	28
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	3	46
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	39	7
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	16	21
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	101	303
Cronos Warrant [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	86	234
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	$ 15	$ 69