Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 349	$ 41
Fair Value of Liabilities	28	4
Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	46	41
Fair Value of Liabilities	28	4
Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	46	37
Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	0	4
Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	7	0
Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	21	4
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	303	0
Equity Contract, Warrant [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	234	0
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	$ 69	$ 0