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Financial Instruments (Narrative) (Details) $ in Millions, $ in Billions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 CAD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 29,300 |  |  | $ 29,300 |  | $ 28,000 |
Loss on Cronos-related financial instruments |  |  |  | 105 | $ 636 |  | 202 | $ 1,327 |  |
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative asset, notional amount |  | $ 1,800 |  |  |  | $ 1,800 |  |  |  | $ 2.4
Loss on Cronos-related financial instruments |  |  |  |  |  | $ 31 |  |  |  |
Cronos [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments, purchase price | $ 2.4 | $ 1,800 | $ 2.4 |  |  |  |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, fair value disclosure |  |  |  | 5,368 |  |  | 5,368 |  | 5,057 |
Long-term debt |  |  |  | 4,960 |  |  | 4,960 |  | 4,741 |
Net Investment Hedging [Member] | Foreign currency contracts [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | 1,402 |  |  | 1,402 |  | 2,246 |
Reported Value Measurement [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  | 29,300 |  |  | 29,300 |  | 28,000 |
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  | $ 33,800 |  |  | $ 33,800 |  | $ 30,700 |

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