Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 504	$ 41
Fair Value of Liabilities	0	4
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	86	41
Fair Value of Liabilities	0	4
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	69	37
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	17	4
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	0	0
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Liabilities	0	4
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	418	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	315	0
Equity Contract, Preemptive Rights [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 103	$ 0