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Financial Instruments (Narrative) (Details) $ in Billions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($) | Mar. 07, 2019 CAD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 07, 2019 USD ($) | Mar. 07, 2019 CAD ($) | Dec. 31, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivatives |  |  |  | $ (636,000,000) |  |  | $ (1,296,000,000) |  |  |  |
Derivative, gain (loss) on derivative, net |  |  |  | (636,000,000) |  | $ 0 | (1,327,000,000) | $ 0 |  |  |
Equity Contract, Preemptive Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivatives |  |  |  | (188,000,000) |  |  | (400,000,000) |  |  |  |
Equity Contract, Warrant [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivatives |  |  |  | (448,000,000) |  |  | (896,000,000) |  |  |  |
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 |  |  |  | 4,937,000,000 |  |  | 4,937,000,000 |  |  |  |
Long-term debt |  |  |  | 4,608,000,000 |  |  | 4,608,000,000 |  |  |  | $ 0
Net Investment Hedging [Member] | Foreign currency contracts [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 1,391,000,000 |  |  | $ 1,391,000,000 |  |  |  | $ 1,226,000,000

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