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Investments in Equity Securities (Investment in Cronos Narrative) (Details) $ / shares in Units, shares in Millions, $ in Billions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 08, 2019 USD ($) shares | Mar. 08, 2019 CAD ($) | Mar. 31, 2019 USD ($) director board_member shares | Mar. 31, 2018 USD ($) | Mar. 08, 2019 $ / shares
Investment [Line Items] |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 1,831,000,000 |  |
Earnings/losses from equity method investments |  |  | $ 86,000,000 | $ 342,000,000 |
Cronos Group Inc. [Member] |  |  |  |  |
Investment [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 |  |  |  |
Earnings/losses from equity method investments |  |  | $ 0 |  |
Number of directors nominated | director |  |  | 4 |  |
Number of members on the Board of Directors | board_member |  |  | 7 |  |
Equity Contract, Preemptive Rights [Member] | Cronos Group Inc. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investment, shares purchased, (CAD per share) | $ / shares |  |  |  |  | $ 16.25
Equity method investment, number of shares eligible for purchase (in shares) | shares |  |  | 40.0 |  |
Payments for derivative instrument, investing activities | $ 500,000,000 |  |  |  |
Equity Contract, Warrant [Member] | Cronos Group Inc. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investment, shares purchased, (CAD per share) | $ / shares |  |  |  |  | $ 19.00
Equity method investment, number of shares eligible for purchase (in shares) | shares | 74.0 |  |  |  |
Payments for derivative instrument, investing activities | $ 1,200,000,000 |  |  |  |

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