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Investments in Equity Securities (Investment in Cronos Narrative) (Details) - Cronos [Member] $ / shares in Units, shares in Thousands, $ in Millions, $ in Billions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 26, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) shares | Mar. 31, 2021 $ / shares
Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  | 43.50% | 42.10% |
Number of ordinary shares owned (approximately) (in shares) | shares |  |  |  | 156,600 |
Equity method investments |  |  | $ 1,173 | $ 1,238 |
Equity method investment, difference between carrying amount and fair value, percentage (approximately) |  | 53.00% | 8.00% |  |
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 |  |  |  | 24,000 |
Equity method investment, aggregate exercise price |  | $ 0.4 |  |  |
Equity Contract, Preemptive Rights [Member] | Subsequent Event [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Equity method investment, aggregate exercise price | $ 300 |  |  |  |
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 |  |  |  | 83,000 |
Equity method investment, percentage of shares eligible for purchase |  |  |  | 10.00% |
Equity method investment, aggregate exercise price |  | $ 1.6 |  |  |
Equity Contract, Warrant [Member] | Subsequent Event [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Equity method investment, aggregate exercise price | $ 1,300 |  |  |  |
Equity Contract, Warrant And Equity Contract, Preemptive Rights [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Equity method investment, warrant exercised, ownership percentage |  | 53.00% |  |  |
Common Stock [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Equity method investments |  |  | $ 1,010 | $ 965 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Fair value of equity investment |  |  | $ 1,100 | $ 1,500 |

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