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Investments in Equity Securities (Investment in Cronos Narrative) (Details) - Cronos [Member] $ / shares in Units, shares in Thousands, $ in Billions |  |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2020 USD ($) | Mar. 31, 2019 CAD ($) | Mar. 31, 2019 USD ($) shares | Mar. 31, 2019 CAD ($) | Sep. 30, 2020 USD ($) director board_member shares | Sep. 30, 2020 CAD ($) | Jun. 30, 2020 | Dec. 31, 2019 USD ($) | Mar. 31, 2019 $ / shares
Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of ordinary shares owned (approximately) (in shares) | shares |  |  | 149,800 |  | 156,600 |  |  |  |
Ownership percentage (approximately) |  |  | 45.00% |  | 44.00% |  | 45.00% |  |
Equity method investments, purchase price |  | $ 2.4 | $ 1,800,000,000 | $ 2.4 |  |  |  |  |
Equity method investment, warrant exercised, ownership percentage (approximately) |  |  | 55.00% | 55.00% |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 400,000,000 |  |  |  |  |  |
Payments for deferred tax liability |  |  | 300,000,000 |  |  |  |  |  |
Number of directors nominated | director |  |  |  |  | 4 |  |  |  |
Equity method investment, number of independent directors nominated | director |  |  |  |  | 1 |  |  |  |
Number of members on the Board of Directors | board_member |  |  |  |  | 7 |  |  |  |
Equity method investments |  |  |  |  | $ 1,087,000,000 |  |  | $ 1,305,000,000 |
Equity method investment, difference between carrying amount and fair value, percentage (approximately) |  |  |  |  | 20.00% | 20.00% |  |  |
Equity Contract, Preemptive Rights [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, shares purchased, (CAD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 16.25
Equity method investment, number of shares eligible for purchase (approximately) (in shares) | shares |  |  |  |  | 35,000 |  |  |  |
Payments for derivative instrument, investing activities |  |  | $ 500,000,000 |  |  |  |  |  |
Equity method investment, aggregate exercise price |  |  |  |  |  | $ 0.6 |  |  |
Equity Contract, Preemptive Rights [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, aggregate exercise price | $ 400,000,000 |  |  |  |  |  |  |  |
Equity Contract, Warrant [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, shares purchased, (CAD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 19.00
Equity method investment, number of shares eligible for purchase (approximately) (in shares) | shares |  |  |  |  | 79,000 |  |  |  |
Equity method investment, percentage of shares eligible for purchase |  |  | 10.00% |  |  |  |  |  |
Payments for derivative instrument, investing activities |  |  | $ 1,200,000,000 |  |  |  |  |  |
Equity method investment, aggregate exercise price |  |  |  |  |  | $ 1.5 |  |  |
Equity Contract, Warrant [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, aggregate exercise price | $ 1,100,000,000 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  | $ 986,000,000 |  |  | 1,002,000,000 |
Equity method investment, impairment |  |  |  |  | 0 |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value of equity investment |  |  |  |  | $ 800,000,000 |  |  | $ 1,200,000,000 |

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