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Investments in Equity Securities (Investment in Cronos Narrative) (Details) - Cronos Group Inc. [Member] $ / shares in Units, shares in Millions, $ in Billions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) shares | Mar. 31, 2019 CAD ($) | Jun. 30, 2020 USD ($) director board_member shares | Jun. 30, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 $ / shares
Investments [Line Items] |  |  |  |  |  |
Number of ordinary shares owned (approximately) (in shares) | shares | 149.8 |  |  |  |  |
Ownership percentage (approximately) | 45.00% |  | 45.00% |  |  |
Equity method investments, purchase price | $ 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 |  |  | $ 1,223,000,000 |  | $ 1,305,000,000 |
Equity method investment, difference between carrying amount and fair value, percentage (approximately) |  |  | (7.00%) | (7.00%) |  |
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 |  |  | 36.0 |  |  |
Payments for derivative instrument, investing activities | $ 500,000,000 |  |  |  |  |
Equity method investment, aggregate exercise price |  |  | $ 400,000,000 | $ 0.6 |  |
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 |  |  | 78.0 |  |  |
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 |  |  | $ 1,100,000,000 | $ 1.5 |  |
Common Stock [Member] |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |
Equity method investments |  |  | 1,017,000,000 |  | 1,002,000,000 |
Equity method investment, impairment |  |  | 0 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |
Fair value of equity investment |  |  | $ 900,000,000 |  | $ 1,200,000,000 |

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