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Financial Instruments (Narrative) (Details) $ in Billions |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($) | Mar. 07, 2019 CAD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Mar. 07, 2019 USD ($) | Mar. 07, 2019 CAD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  | $ 3,000,000,000.0 |  | $ 0 |  |
Derivative, gain (loss) on derivative, net |  |  |  | (137,000,000) | $ (425,000,000) |  |  |
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative asset, notional amount |  |  |  |  |  |  | $ 1,800,000,000 | $ 2.4
Derivative, gain (loss) on derivative, net |  |  |  |  | $ 31,000,000 |  |  |
Cronos Group Inc. [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Equity method investments, purchase price | $ 1,800,000,000 | $ 2.4 | $ 2.4 |  |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Debt instrument, fair value disclosure |  |  |  | 4,595,000,000 |  | 5,057,000,000 |  |
Long-term debt |  |  |  | 4,666,000,000 |  | 4,741,000,000 |  |
Net Investment Hedging [Member] | Foreign currency contracts [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | 2,246,000,000 |  | 2,246,000,000 |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  | 27,000,000,000.0 |  | 28,000,000,000.0 |  |
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  | $ 28,300,000,000 |  | $ 30,700,000,000 |  |

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