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Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | $ 240 | $ 349
Fair Value of Liabilities | 0 | 28
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 74 | 46
Fair Value of Liabilities | 0 | 28
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 55 | 46
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 19 | 0
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Liabilities | 0 | 7
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Liabilities | 0 | 21
Equity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 166 | 303
Cronos Warrant [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 132 | 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 | $ 34 | $ 69

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