Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 1,121	$ 41
Fair Value of Liabilities	16	4
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	45	41
Fair Value of Liabilities	16	4
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	45	37
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	0	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	16	4
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	1,076	0
Equity Contract, Warrant [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	763	0
Equity Contract, Preemptive Rights [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Assets	$ 313	$ 0