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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

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