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Financial Instruments (Fair Value Derivative Financial Instruments) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | $ 35 | $ 163
Fair Value of Liabilities | 0 | 87
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 0 | 0
Fair Value of Liabilities | 0 | 87
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 0 | 0
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 0 | 0
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Liabilities | 0 | 87
Foreign currency contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Liabilities | 0 | 0
Equity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 35 | 163
Cronos Warrant [Member] | Not Designated as Hedging Instrument [Member] | Investments In Equity Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Assets | 32 | 139
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 | $ 3 | $ 24

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